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identity

Pronunciation: /aɪˈdɛntɪti/

The English word “identity” has 7 meanings listed here.

noun

  1. Sameness, identicalness; the quality or fact of (several specified things) being the same.
  2. The difference or character that marks off an individual or collective from the rest of the same kind; selfhood; the sense of who something or someone or oneself is, or the recurring characteristics that enable the recognition of such an individual or group by others or themselves.
  3. A name or persona—a mask or appearance one presents to the world—by which one is known.
  4. An equation which always holds true regardless of the choice of input variables.
  5. Any function which maps all elements of its domain to themselves.
  6. An element of an algebraic structure which, when applied to another element under an operation in that structure, yields this second element.
  7. A well-known or famous person.

Etymology

From Middle English ydemptite, from Middle French identité and its etymon Late Latin idemptitās, identitās, from idem (“the same”) + -tās (suffix forming abstract nouns) as a calque of Ancient Greek ταὐτότης (tautótēs, “sameness”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.