Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Being the same: another orator who used the senator's identical words.
  • adj. Exactly equal and alike.
  • adj. Having such a close similarity or resemblance as to be essentially equal or interchangeable.
  • adj. Biology 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Bearing full likeness by having precisely the same set of characteristics; indistinguishable.
  • adj. Not different or other; not another or others; not different as regards self; selfsame; numerically identical.
  • adj. Having some particular qualities or characteristics in common, but not all of them.
  • adj. Of twins, sharing the same genetic code.
  • adj. Exactly equivalent.
  • adj. Approximating or approaching exact equivalence.
  • n. Something which has exactly the same properties as something else.

from the GNU version of the Collaborative International Dictionary of English

  • adj. The same; the selfsame; the very same; not different.
  • adj. Uttering sameness or the same truth; expressing in the predicate what is given, or obviously implied, in the subject; tautological.

from The Century Dictionary and Cyclopedia

  • Being the same; absolutely indistinguishable; distinguishable only as points of view of that which is one in its own being: also used loosely to express the fact that two or more things compared are the same in the particulars considered, or differ in no essential point.
  • Expressing identity.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. exactly alike; incapable of being perceived as different
  • adj. (of twins) derived from a single egg or ovum
  • adj. having properties with uniform values along all axes
  • adj. being the exact same one; not any other:
  • adj. coinciding exactly when superimposed

Etymologies

From Medieval Latin identicus, from Late Latin identitās, identity; see identity.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From identic +‎ -al. (Wiktionary)

Examples

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