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English definition of “identity”

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noun [C]  /ɑɪˈden·tɪ·t̬i/ us  

identity noun [C] (person)

who a person is, or the qualities of a person or group that make them different from others: [U] As a journalist she refuses to reveal the identity of her source.

identity noun [C] (mathematical statement)

algebra an equation (= mathematical statement) that is true for every value given to a variable (= number that can change)
(Definition of identity from the Cambridge Academic Content Dictionary © Cambridge University Press)
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