Webster's English Dictionary

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identity

iden.ti.ty \i--'den(t)-*t-e-\ n [ML identite`, fr. LL identitat-, 
   identitas, irreg, fr. L Xidem same, fr. is that - more at ITERATE 1a: 
   sameness of essential or generic character in different instances  1b: 
   sameness in all that constitutes the objective reality of a thing : 
   (MONENESS 2: unity and persistence of personality  3: the condition of 
   being the same with something described or asserted  4: IDENTICAL EQUATION