| noun | the distinct personality of an individual regarded as a persisting entity “you can lose your identity when you join the army” |
| noun | the individual characteristics by which a thing or person is recognized or known “geneticists only recently discovered the identity of the gene that causes it” |
| noun | an operator that leaves unchanged the element on which it operates “the identity under numerical multiplication is 1” |
| noun | exact sameness “they shared an identity of interests” |
| identify | verb | recognize as being; establish the identity of someone or something |
| identical | adjective | being the exact same one; not any other: |
| indistinguishable | adjective | exactly alike; incapable of being perceived as different |