D defs.my
Entry 3 senses Webster, 1913

Identity

/īd-ĕn'-tĭt-ēˌ/ · I·den·ti·ty · IPA /aɪˈdɛn(t)ɪti/
01 n. The state or quality of being identical, or the same; sameness.
pl. Identities ((#))
  1. 1.
    The state or quality of being identical, or the same; sameness.
    Identity is a relation between our cognitions of a thing, not between things themselves.” Sir W. Hamilton.
  2. 2.
    The condition of being the same with something described or asserted, or of possessing a character claimed; as, to establish the identity of stolen goods.
  3. 3.
    An identical equation.(Math.)