200 Philosophical Concepts
Two hundred ideas from Greek, Indian, Chinese, Islamic, African and Western thought — each explained plainly, then properly, with the case that shows what it means.
How this list was made
What a page here does, and what it does not
Each entry answers one question: what is this? It is explained twice — first in plain words for someone who has never met the term, then as a philosopher would put it, with the distinctions that actually do the work. Then there is a case: not an analogy for the idea, but a real situation in which the question arises and has to be settled one way or the other.
What you will not find is a history of the term. Every encyclopaedia already carries that, and it is what makes reference pages read as filler. Where the history bears on the meaning it appears in a single line — who fixed the word and in which book — and both of those are links rather than paragraphs.
Plain first, and deliberately
The plain account comes before the technical one on every page. That order is not a matter of layout. It is the account most readers arrived for, and leading with the specialist version is how a reference site loses the people it was built for while telling itself it is being rigorous.
What is actually disputed
Every concept here is contested. That is largely why it survived the selection: ideas nobody argues about stop being philosophical and become definitions. So each entry ends by saying what the disagreement is and who is on which side of it.
A page that presents a contested concept as settled is worse than no page at all, because it is quietly false and reads as authoritative. Justification, free will, the self and truth have no agreed account, and pretending otherwise would be the easiest way to make this section useless.
Commonly confused with
Karma is not cosmic payback. Nirvāṇa is not annihilation. Dialectic is not debate. A language game is not a game. Nature, in most of the sentences in which philosophers use it, has nothing to do with the countryside.
Every entry names at least one thing it is regularly mistaken for and says what the difference is. These are the corrections people actually arrive looking for, and they are also what ties the section together: each one is a link to another entry.
There is no "world traditions" section, and that is the point
Concepts are filed by what they are about, never by where they came from. Karma sits with causation, because it is a claim about how consequences follow from acts. Śūnyatā sits with nothingness and emptiness, because that is the argument it is part of. Anātman sits directly beneath ātman and beside personal identity, since the three are one long dispute. Wu wei sits with agency and free will. Ubuntu sits in ethics, next to moral personhood.
Forty-four entries carry a non-European tradition, and they appear in all ten themes rather than in an appendix. A section called "concepts from other traditions" would say that the European material is the subject and the rest is decoration, which is both false and the opposite of what a reader needs when they are trying to understand a single idea.
The tradition that fixed each term is recorded in its own field, and can be filtered on. Sixty-five entries are marked cross-tradition, because being, truth, causation and justice were not fixed anywhere in particular.
Where the term came from
Each entry names its term in its own script where it has one, with a transliteration, and gives the unaccented spelling as well so that either finds the page. Where a date is disputed or traditional it is marked as such rather than printed flat, because a date is a claim about a record and not a fact about an idea.
One consequence worth stating: li appears twice. 禮, ritual propriety, is in ethics; 理, principle or pattern, is in metaphysics. Same romanisation, different character, different concept, and collapsing them into one page would produce a single confidently wrong entry rather than two right ones.
Every concept links out
A concept page names the philosophers who argued about it, the works where the argument happens, and the schools that formed around a position on it. Those are live links into the rest of this atlas, and they run both ways.
This is the reason the section is here rather than anywhere else. An isolated glossary is a dead end. A concept that connects to the person who fixed it, the book that fixed it and the movement that carried it is the same information doing considerably more work.
It is a selection
Two hundred concepts in ten themes cannot be the complete vocabulary of philosophy, and nothing here pretends otherwise. Terms were merged where two headings would have produced one page said twice, and left out where the idea is a component of another rather than a subject of its own. What remains is meant to be the set you would need to read almost anything in the rest of this atlas without being stopped by a word.
200 entries
Being and reality
Actuality
Being at work rather than merely being able to - the condition of a thing that is doing what it is for.
c. 330 BC
Appearance and reality
The possibility that things are systematically not as they present themselves, and what follows if they are not.
c. 475 BC
Becoming
Reality understood as process rather than as things - what is, taken to be what is happening.
c. 500 BC
Being
Existence considered in itself, rather than the study of any particular thing that exists.
c. 475 BC
Contingency
What is the case but might not have been - and whether that is a fact about the world or about our ignorance.
c. 1020
Emergence
The appearance of properties at one level of organisation that the parts do not have and that were not obviously predictable from them.
1875
Essence
What makes something the kind of thing it is, as distinct from the features it merely happens to have.
c. 330 BC
Existence
The condition of being real, as distinct from being merely thought of, described or defined.
c. 1020
Form
The organising structure that makes something what it is, as distinct from the material it is made of.
c. 380 BC
Identity
What makes something the same thing, either as one thing rather than two or as one thing over time.
1714
Infinity
That which has no limit - and the long argument over whether anything actual can be like that.
c. 570 BC
Li (principle)
The intelligible pattern in things - what makes each thing the kind of thing it is, and the reason it can be understood at all.
c. 1175
Matter
What a thing is made of, considered apart from what it has been made into.
c. 330 BC
Māyā
The appearance that conceals - the world as ordinarily taken, real enough to act on and not what it is taken to be.
c. 800
Necessity
What could not have been otherwise - and the several very different reasons a thing might not have been able to be otherwise.
c. 330 BC
Nothingness
Absence considered as a subject in its own right - and whether there is anything to consider.
c. 475 BC
Particulars
Individual things - this one and no other - and what it is that makes one of them this one.
c. 330 BC
Possibility
What could be the case, whether or not it is - and the question of what makes such a claim true.
c. 330 BC
Potentiality
A real capacity to become or to act, present in a thing while it is not being exercised.
c. 330 BC
Qi
The vital, material energy that constitutes and animates everything - not a substance things are made of, but the activity they are.
c. 320 BC
Relationality
That things are constituted by their relations rather than possessing their natures independently and then entering into them.
c. 150
Substance
Whatever it is that has properties, as distinct from the properties it has.
c. 330 BC
Universals
Whatever it is that many different things share when the same word is true of all of them.
c. 380 BC
Yin and yang
Complementary and interdependent aspects whose alternation constitutes change - never two forces, and never fixed to anything.
c. 300 BC
Śūnyatā
That nothing has an independent nature of its own - everything is what it is only in relation to conditions, including emptiness itself.
c. 150
Cause, time and change
Causation
The relation by which one thing brings about another - used constantly and never satisfactorily analysed.
c. 330 BC
Chance
Outcomes not fixed by what preceded them - or by ignorance of what did, which are very different claims.
c. 330 BC
Change
Something being different at one time from another while remaining the same thing - which is either obvious or impossible.
c. 500 BC
Dependent origination
That everything arises in dependence on conditions and nothing exists independently - the Buddhist alternative to causes acting on things.
c. 450 BC
Determinism
That the state of the world at any moment, together with the laws, fixes every later state.
1677
Explanation
Making something intelligible by showing why it is so - and the question of what makes an account explanatory rather than merely true.
1948
Fate
That an outcome will occur whatever anyone does - which is a stronger and stranger claim than determinism.
c. 250 BC
Karma
Action and its consequences for the agent - a moral causal order, understood very differently across the traditions that share the word.
c. 700 BC
Space
The extension in which things are located - and whether it is a container, a set of relations, or a form of experience.
1716
Teleology
Explanation by what something is for - expelled from physics, indispensable in biology, and still unsettled.
c. 330 BC
Time
The order and passage of events - and the question of whether passing is a feature of the world or of the observer.
c. 397
Knowledge, truth and reason
A priori and a posteriori
Knowledge that does not depend on experience for its justification, and knowledge that does.
1781
Abduction
Reasoning to whatever would best account for what you have observed - the only mode that generates new ideas.
1878
Belief
Taking something to be the case - the basic attitude that can be true or false, and the one you cannot adopt at will.
c. 380 BC
Coherence
Truth or justification understood as fit within a system, rather than as contact with something outside it.
1807
Correspondence
Truth understood as a relation between what is said and how things are - the theory almost everyone assumes and nobody can state.
c. 1270
Deduction
Reasoning in which the conclusion cannot be false if the premises are true.
c. 330 BC
Doubt
Withholding assent - and the difference between doubt that leads somewhere and doubt that is manufactured to prevent it.
1641
Experience
What is undergone and learned from - both the raw material of knowledge and, in the plural, the sum of what one has lived.
c. 330 BC
Fallibility
That any belief, however well supported, may turn out to be wrong - held as a working principle rather than as a counsel of despair.
1878
Ignorance
Not merely the absence of knowledge but, in several traditions, an active misapprehension that has to be removed.
c. 450 BC
Induction
Reasoning from observed cases to a general claim - reliable, indispensable, and without any accepted justification.
c. 330 BC
Inference
Moving from what you have to what you do not - concluding one thing on the strength of another.
c. 330 BC
Intuition
Understanding that arrives without conscious inference - and the question of whether it is a source of knowledge or a fast summary of experience.
1641
Justification
What makes a belief one a person is entitled to hold, rather than one they merely happen to have.
1641
Knowledge
Believing something true, on grounds that make the truth of it no accident.
c. 369 BC
Maʿrifa
Knowledge arrived at by direct realisation rather than by argument - and the claim that some things can be reached no other way.
c. 1100
Objectivity
Judgement that does not depend on who is making it - and the question of whether anything is like that.
1781
Perception
Awareness of the world through the senses - and the question of whether it delivers the world or a version of it.
c. 330 BC
Pramāṇa
A reliable source of knowledge - and the Indian tradition's question of how many there are.
c. 200
Reason
The capacity to work out what follows, what to conclude and what to do - and the question of what it is for.
c. 500 BC
Scepticism
The position, or the practice, of holding that knowledge is not available - or of declining to settle whether it is.
c. 200
Subjectivity
Experience and judgement from a particular position - both a limitation on knowledge and the only place any of it happens.
1846
Testimony
Knowledge taken from what others report - the source almost everything anyone knows actually came from.
1764
Truth
The property a claim has when things are as it says they are - and the argument over what that amounts to.
c. 330 BC
Wisdom
Sound judgement about what matters and what to do - a capacity that knowledge alone does not supply.
c. 340 BC
Logic, language and interpretation
Category
A fundamental class used to organise thought or reality - and the question of whether the divisions are found or imposed.
c. 330 BC
Catuṣkoṭi
Four exhaustive alternatives where European logic recognises two - and the practice of rejecting all four.
c. 150
Concept
A general unit of thought that lets a mind classify, and the question of what having one consists in.
1781
Definition
An account of what something is or what a word means - and the question of what makes one correct.
c. 330 BC
Dialectic
Reasoning that proceeds through opposition - by question and answer, or by contradictions that force a position to develop.
c. 380 BC
Discourse
An organised system of statements, categories and practices that settles what can be said and who can say it.
1966
Excluded middle
The principle that every proposition is either true or false, with no third option - and the traditions that decline it.
c. 330 BC
Hermeneutic circle
That the parts are understood through the whole and the whole through its parts - a circle that is not vicious but is how understanding works.
1927
Interpretation
The activity of determining what something means - and the question of whether the meaning is found or made.
1819
Language game
A rule-governed practice in which words get their meaning from what is done with them.
1953
Meaning
What a word, sentence, action or life signifies - and the question of what makes it signify that rather than something else.
1892
Non-contradiction
The principle that nothing can both be and not be, in the same respect and at the same time.
c. 330 BC
Paradox
An argument that appears sound and leads somewhere unacceptable - which means something in it must go, and it is never obvious what.
c. 450 BC
Proposition
The content expressed by a statement - what is true or false, as distinct from the words used to say it.
1903
Rectification of names
That social order depends on words matching what they name - and that fixing the language is a political act.
c. 480 BC
Reference
The relation between an expression and the thing it picks out.
1905
Sense
The way an expression presents what it refers to - what is left over when two names for the same thing still differ.
1892
Sign and symbol
Something that stands for something else - and the question of how much of that standing-for is convention.
1868
Speech act
An utterance that performs an action rather than describing one.
1955
Sufficient reason
That everything has an explanation - and the question of whether anything is entitled to assume so.
1714
Validity
The property of an argument whose conclusion cannot be false if its premises are true - a guarantee about form, and about nothing else.
c. 330 BC
Mind, self and consciousness
Agency
The capacity to act rather than merely to move, and the sense that a movement is one's own doing.
c. 340 BC
Anātman
That no permanent, independent self is to be found - not that there is no person, but that there is no owner behind the person.
c. 450 BC
Authenticity
Living from commitments one actually owns, rather than from those absorbed unexamined from everyone else.
1927
Consciousness
The fact that there is something it is like to be a subject - awareness itself, rather than what one is aware of.
1641
Desire
Orientation toward something not yet had - and whether wanting is a state that represents the world or one that pushes at it.
c. 380 BC
Embodiment
That mind and experience are shaped by having a body, and are not merely housed in one.
1945
Emotion
States combining feeling, judgement and motivation - and the question of which of the three is doing the defining.
c. 340 BC
Free will
The capacity to choose and to have been able to choose otherwise - and whether anything answers to that description.
c. 397
Imagination
The capacity to represent what is absent, altered or not the case at all.
c. 330 BC
Intentionality
The property of being about something - the way a thought, unlike a stone, is directed at what it is not.
1901
Intersubjectivity
Shared understanding between subjects - and the argument that it comes before individual subjectivity rather than after it.
1913
Mind
The domain of thought, feeling and awareness - and the question of where its boundary falls.
c. 450 BC
Mind–body problem
How mental and physical phenomena are related, given that neither an identity nor a separation between them survives inspection.
1641
Other minds
How anyone knows that other beings have experience, given that only one case is ever available from the inside.
1865
Personal identity
What makes someone at one time the same person as someone at another - and whether that is what actually matters.
1694
Qualia
The felt quality of an experience - what seeing red or feeling pain is like from the inside, as distinct from anything measurable about it.
1929
Responsibility
Being properly held to account for what one has done - and the conditions under which holding someone to account makes sense.
c. 340 BC
Self
The subject to whom experiences and actions are attributed - and whether anything answers to that description.
1694
The unconscious
Mental processes that shape what a person does while remaining outside awareness.
1900
Will
Wanting treated as a faculty - the part of a person that decides, as distinct from the part that reasons or the part that feels.
c. 397
Wu wei
Acting without forcing - effectiveness that comes from according with how things already run rather than imposing on them.
c. 350 BC
Ātman
The innermost self - not the personality or the body, but the awareness that all of those appear to.
c. 700 BC
Ethics and character
Ahiṃsā
Non-injury to living beings - a discipline covering thought and speech as well as action, and not merely a policy of restraint.
c. 500 BC
Alterity
Difference that cannot be reduced to a variation on oneself - otherness that resists being absorbed into a familiar category.
1961
Autonomy
Governing oneself by one's own considered judgement - and the question of how much of that judgement is one's own.
1785
Care
Attentive responsiveness to particular others, proposed as a moral foundation rather than a supplement to principles.
1982
Compassion
Concern at another's suffering together with the wish to relieve it - and the question of whether the feeling is what does the work.
c. 450 BC
Conscience
The internal judgement that one's own conduct is right or wrong - and the question of what authority it has.
c. 397
Consequences
Judging an act by what it brings about - and the difficulty of knowing what that is.
1789
De
The power that accrues to someone whose conduct is right - authority that works without being exercised.
c. 500 BC
Dharma
The sustaining order of things, and the conduct it requires of a particular person in a particular position.
c. 700 BC
Dignity
Worth that commands respect and cannot be traded - the claim that a person is not a price.
1785
Double effect
The principle that causing a harm as a foreseen side effect can be permissible where causing it as a means or an end would not.
c. 1270
Duty
What one is required to do irrespective of what one wants, and irrespective of what it produces.
1785
Filial piety
Obligation within the family, taken as the root from which all wider obligation grows.
c. 480 BC
Flourishing
A life going well through the full exercise of human capacities - a condition rather than a feeling.
c. 340 BC
Happiness
Well-being or a life going well - and the argument over whether that is a feeling, a judgement or a condition.
c. 340 BC
Is–ought gap
That no description of how things are yields a conclusion about how they ought to be, without something evaluative already smuggled in.
1739
Li (ritual propriety)
The forms of conduct through which relations are made right - and the claim that form shapes disposition rather than merely expressing it.
c. 480 BC
Moral law
A standard of conduct binding on everyone, holding whether or not any legislature has enacted it.
c. 1270
Moral luck
Judgement resting on factors outside anyone's control - which is supposed to be impossible and happens constantly.
1976
Moral personhood
The status of being owed moral consideration in one's own right - and the question of what confers it.
1694
Pleasure
Experience that is positively valued in itself - and the argument over whether it is the only thing that is.
c. 300 BC
Ren
Humaneness - the disposition that makes conduct toward others fully human, and the central virtue of the Confucian tradition.
c. 480 BC
Suffering
Painful or unsatisfactory experience - and the question of whether it is an accident of life or a structural feature of it.
c. 450 BC
The golden mean
Excellence as the fitting point between excess and deficiency - not the midpoint, but the amount the situation calls for.
c. 340 BC
The good
What is ultimately worth pursuing - and whether there is one such thing or many.
c. 380 BC
The good life
The question of how a human being ought to live, taken as one question rather than as a list of separate problems.
c. 400 BC
The Other
Another person encountered as making a claim on you before any theory about them - the ethical relation taken as prior to knowledge.
1961
Ubuntu
Personhood realised through other persons - a claim about what a human being is, not advice about being sociable.
1969
Utility
Benefit produced, taken as the measure of right action - and the problem of adding it up across people.
1789
Value
What it is for anything to matter - and whether mattering is discovered in the world or conferred on it.
1887
Virtue
A settled excellence of character - a disposition to feel, judge and act well, not merely to follow rules.
c. 340 BC
Society, politics and power
Alienation
Separation from one's own activity, its products, other people, or oneself - a condition produced by arrangements rather than by temperament.
1844
Civil disobedience
Public, conscientious breach of law aimed at changing it, undertaken by people who accept the legal order in general.
1971
Common good
Goods that are shared rather than divided - benefits nobody has alone and everybody loses together.
c. 1270
Country
In Aboriginal Australian thought, a living network of land, waters, beings, ancestry and obligation - not a place one is from but a party one is answerable to.
Covenant
A binding relationship that constitutes the parties rather than merely exchanging obligations between them.
c. 1140
Domination
Being subject to another's arbitrary power - whether or not that power is ever exercised.
1997
Emancipation
Release from domination or subordination - and the question of what has actually changed when it is granted rather than taken.
1843
Equality
Equal moral standing, opportunity or treatment - and the question of equality of what.
1762
Hegemony
Dominance maintained through consent rather than force - where the arrangement is accepted by those it disadvantages.
1935
Ideology
A framework of ideas that organises social life and, on the critical account, conceals the arrangement it serves.
1846
Justice
The fair distribution of rights, benefits and burdens - and the argument over what fairness requires.
c. 380 BC
Legitimacy
The entitlement to exercise power - as distinct from the ability to exercise it.
1651
Liberty
Freedom from interference, or the capacity to govern oneself - two ideas that share a word and recommend different states.
1859
Oppression
Systematic disadvantage imposed on a group, produced by structures rather than requiring anyone to intend it.
1990
Power
The capacity to shape what others do, what they can do, and what they take to be possible.
1532
Praxis
Action that carries theory within it and changes what it acts on - as against theory applied afterwards.
1845
Property
Socially recognised control over things - a relation between people about a thing, rather than between a person and a thing.
1689
Recognition
Being acknowledged by others as what one is - treated not as a courtesy but as a condition of being a self at all.
1807
Revolution
The replacement of a political order rather than of its occupants - and the question of what could warrant it.
1789
Rights
Justified claims that protect interests, choices or status - and the question of where they come from.
1689
Social contract
Political order understood as arising from agreement among the governed - as history, as hypothesis, or as a test.
1651
Solidarity
Standing with others on the basis of a shared situation or cause, including where one's own interest is already secured.
1848
Sovereignty
Supreme authority within a territory, answerable to no higher power - and the question of whether anything actually has it.
1651
The state
The standing apparatus of rule over a territory - and the question of what, if anything, justifies it.
1532
Tikkun olam
The obligation to repair what is broken in the world - a phrase whose meaning has shifted three times.
c. 200
Tolerance
Deliberately not suppressing what one has the power and the reason to suppress.
1689
Life, death and meaning
Absurdity
The confrontation between a human demand for meaning and a world that supplies none - located in the relation, not in either side.
1942
Anxiety
Unease with no particular object, arising from freedom itself - a philosophical concept rather than a clinical one.
1844
Death
The end of a life - and the surprisingly unsettled questions of when it occurs and whether it is bad for the one who dies.
c. 300 BC
Despair
In Kierkegaard's technical sense, a misrelation in the self's relation to itself - not a mood but a structural condition.
1849
Finitude
That a human life is bounded - in time, in knowledge, in power - and that this shapes everything within it rather than merely ending it.
1927
Hope
Orientation toward a wanted outcome that is possible and not assured - and the question of whether it helps or evades.
c. 1270
Meaning of life
Whether a human life can be significant, and what would make it so - a question distinct from whether it is happy or good.
1942
Mokṣa
Release from the round of rebirth and from what binds one to it - the final aim of the Hindu, Jain and Yogic traditions.
c. 800
Nihilism
That nothing has value, meaning or purpose - a family of distinct claims usually run together.
1887
Nirvāṇa
The extinction of craving, and with it of suffering and rebirth - named by a metaphor of a flame going out.
c. 450 BC
Saṃsāra
The recurring round of birth, death and rebirth - and the condition liberation is liberation from.
c. 700 BC
Beauty and art
Aesthetic experience
A way of attending that seeks nothing from what it attends to - and the question of whether such a state exists.
1790
Art
What makes something a work of art at all - a question that only became urgent when the obvious answers stopped working.
1964
Beauty
What pleases in being contemplated - and the two-thousand-year argument over whether that is a fact about the object or about us.
c. 380 BC
Creativity
The production of what is both new and valuable - and the question of whether it is a faculty or a process.
1790
Mimesis
Art as imitation of the world - the oldest account of what art does, and the oldest charge against it.
c. 380 BC
Mono no aware
The poignancy of things because they pass - an aesthetic in which impermanence is the source of value rather than a loss.
1796
Rasa
The savoured emotional essence a work produces in a prepared audience - Indian aesthetics' answer to what art is for.
c. 1000
Taste
The capacity to judge aesthetic value - and whether such judgements can be better or worse rather than merely different.
1757
The sublime
What overwhelms the capacity to take it in - and is found valuable for overwhelming it.
1790
Cosmos, the sacred and ultimate reality
Arguments for God
The attempts to establish that God exists by reasoning rather than by revelation.
1078
Brahman
The ultimate reality underlying everything - and, on the strongest reading, not different from the self.
c. 800
Cosmos
The universe considered as an ordered whole - a claim about arrangement rather than a synonym for everything.
c. 530 BC
Creation
The world's origination from a source - and whether that is an event in time or a relation of dependence.
c. 400
Dao
The Way - the course things follow and the source they follow it from, named by a word that means road.
c. 350 BC
Faith
Commitment that goes beyond what the evidence establishes - held as a virtue by some traditions and as a failure by others.
c. 1270
Fiṭra
The original disposition every human is born with - on the standard reading, an innate orientation toward God.
c. 1100
God
A supreme being, variously conceived - and a concept whose attributes generate most of the problems attached to it.
c. 1270
Immortality
Continuing to exist after bodily death - and the question of what would have to persist for it to be you.
c. 380 BC
Mana
Efficacy that shows itself in results - a Māori and wider Pacific concept badly served by its English career as a magical force.
Mysticism
Experience reported as direct contact with ultimate reality - and the question of whether it is evidence of anything.
1902
Nature
What things are of themselves, and the whole of what is not made by us - two senses that constantly interfere.
c. 330 BC
Soul
What makes a living thing alive - which for Aristotle includes plants, and for the modern reader means almost the opposite.
c. 330 BC
Tapu
Restriction arising from sacredness - the Pacific concept that gave English the word taboo and lost most of its meaning on the way.
Tawḥīd
The oneness of God - not a count but a claim about unity so strict that it constrains everything sayable about the divine.
c. 1100
The Dreaming
The Aboriginal Australian framework of ancestral creation, law and country - named in English by a word that misleads in almost every respect.
The problem of evil
That the suffering in the world is hard to reconcile with a God who is all-powerful, all-knowing and perfectly good.
c. 400
The sacred
What is set apart and treated as not available for ordinary use - a category defined by a boundary rather than by a content.
c. 400
Transcendence
Being beyond the reach of ordinary experience or concepts - and the problem of saying anything about what is beyond saying.
c. 260
Nothing matches those filters.