Definition of Identity

Noun: identity I'den-ti-tee

The distinct personality of an individual regarded as a persisting entity
"you can lose your identity when you join the army";
- personal identity, individuality
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"; "it was too dark to determine his identity"; "she guessed the identity of his lover"
An operator that leaves unchanged the element on which it operates
"the identity under numerical multiplication is 1";
- identity element, identity operator
Exact sameness
"they shared an identity of interests";
- identicalness, indistinguishability