identity
/aɪˈdentətɪ; aɪ`dɛntətɪ/ n
1 [C, U] who or what sb/sth is 本身; 本体; 身分
There is no clue to the identity of the thief. 没有确定窃贼身分的线索.
The cheque will be cashed on proof of identity. 这张支票凭身分证件兑现.
This is a clear case of mistaken identity, eg when the wrong person is arrested by mistake. 这显然是个误认的案例（如捕错人）.
2 [U] (state of) exact likeness or sameness 相同（性）; 一致（性）.