identity

identity
n. (pl. -ies)
1 a the quality or condition of being a specified person or thing. b individuality, personality (felt he had lost his identity).
2 identification or the result of it (a case of mistaken identity; identity card).
3 the state of being the same in substance, nature, qualities, etc.; absolute sameness (no identity of interests between them).
4 Algebra a the equality of two expressions for all values of the quantities expressed by letters. b an equation expressing this, e.g. (x + 1)(2) = x(2) + 2x + 1.
5 Math. a (in full identity element) an element in a set, left unchanged by any operation to it. b a transformation that leaves an object unchanged.
Phrases and idioms:
identity crisis a phase in which an individual feels a need to establish an identity in relation to society. identity parade = identification parade.
Etymology: LL identitas f. L idem same

Useful english dictionary. 2012.

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