Etymology
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identical (adj.)

1610s as a term in logic; general sense of "being the same or very similar" is from 1630s, from Medieval Latin identicus "the same," from Late Latin identitas "identity, sameness," ultimately from combining form of Latin idem "the same" (see idem). Replaced Middle English idemptical (late 15c.), from Medieval Latin idemptitas "identity," from Latin idem. Related: Identically.

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Definitions of identical

identical (adj.)
being the exact same one; not any other:;
this is the identical room we stayed in before
Synonyms: selfsame / very
identical (adj.)
exactly alike; incapable of being perceived as different;
cars identical except for their license plates
rows of identical houses
identical (adj.)
(of twins) derived from a single egg or ovum;
identical twins are monovular
Synonyms: monovular
identical (adj.)
having properties with uniform values along all axes;
identical (adj.)
coinciding exactly when superimposed;
identical triangles
Synonyms: superposable
From wordnet.princeton.edu