the state or fact of remaining the same one or ones, as under varying aspects or conditions:

The identity of the fingerprints on the gun with those on file provided evidence that he was the killer.

the condition of being oneself or itself, and not another:

He began to doubt his own identity.

condition or character as to who a person or what a thing is; the qualities, beliefs, etc., that distinguish or identify a person or thing:

a case of mistaken identity; a male gender identity; immigrants with strong ethnic identities.

the state or fact of being the same one as described.

the sense of self, providing sameness and continuity in personality over time and sometimes disturbed in mental illnesses, as schizophrenia.

exact likeness in nature or qualities:

an identity of interests.