identity (
http://definr.com/identity)
n 1: the distinct personality of an individual regarded as a
persisting entity: "you can lose your identity when you
join the army" [syn:
individuality]
2: collective aspect of the set of characteristics by which a
thing is recognizable or known
3: an operator that leaves unchanged the element on which it
operates; "the identity under numerical multiplication is
1" [syn:
identity element,
identity operator]
4: exact sameness; "they shared an identity of interests" [syn:
identicalness,
indistinguishability]