[ahy-den-ti-kuhl, ih-den-]
similar or alike in every way: The two cars are identical except for their license plates.
being the very same; selfsame: This is the identical room we stayed in last year.
agreeing exactly: identical opinions.

1610–20; < Medieval Latin identic(us) identic + -al1

identically, adverb
identicalness, noun
nonidentical, adjective
pseudoidentical, adjective
quasi-identical, adjective
quasi-identically, adverb
unidentical, adjective
unidentically, adverb

3. congruous, congruent, equal, matching. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
identical (aɪˈdɛntɪkəl)
1.  Also called: numerically identical being one and the same individual: Cicero and Tully are identical
2.  Also called: quantitatively identical exactly alike, equal, or agreeing
3.  Compare fraternal designating either or both of a pair of twins of the same sex who developed from a single fertilized ovum that split into two
[C17: from Medieval Latin identicus, from Latin idem the same]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1620, as a term in logic, from M.L. identicus "the same," from L.L. identitas "identity," ult. from L. idem "the same" (from id "it, that one") + demonstrative suffix -dem. Replaced M.E. idemptical, from M.L. idemptitas, from L. idem.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

identical i·den·ti·cal (ī-děn'tĭ-kəl)

  1. Exactly equal and alike.

  2. Of or relating to a twin or twins developed from the same fertilized ovum and having the same genetic makeup and closely similar appearance; monozygotic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Instead the walls are lined with row after row of identical plaques.
On the face of things, the outcomes are identical in both situations.
Animals and their clones, though, don't always look identical.
Two castes of paper wasps are genetically identical.
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