| identity crisis | <psychology> Chaotic concept of self wherein one's role in life appears to be an insoluble dilemma often expressed by isolation, withdrawal, rebellion and extremism. (12 Dec 1998) |
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| identity disorder | A mental disorder of childhood or adolescence in which one suffers severe distress regarding one's ability to reconcile aspects of the self into a coherent acceptable sense of self. (05 Mar 2000) |
| identity matrix | A square matrix in which the quantities on the diagnonal from top left to bottom right are all equal to 1 and all the other entries are 0. (05 Mar 2000) |
| ego identity | The ego's sense of its own identity. (05 Mar 2000) |