(philosophy) The criteria for the persistence of persons over time (i.e what makes one the same person as one was yesterday, or ten years ago), and the criteria for the individuation of persons from others.

plural of identity document

A document which may be used to prove a person's identity.

plural of identity parade

(mathematics) An analog of the formula det(AB) = det(A) det(B), for certain matrices with noncommuting entries, related to the representation theory of the Lie algebra glₙ. It can be used to relate an invariant ƒ to the invariant Ωƒ, where Ω is Cayley's Ω process.

(psychology) The age category such as "child", "young adult", "old person", etc. that is part of a person's self-identity.

(psychiatry) A mental disorder characterized by the presence of two or more personality states or distinct identities that repeatedly take control of a person's behavior.

A condition in which the patient experiences significant gender dysphoria: the diagnostic classification most commonly applied to transgender/transsexual people.

A component on a SIM card that stores information to identify a mobile phone user.

plural of Subscriber Identity Module