[noun, adjective doo-pli-kit, dyoo-; verb doo-pli-keyt, dyoo-]
verb (used with object), du·pli·cat·ed, du·pli·cat·ing.
  1. to make an exact copy of.
  2. to do or perform again; repeat: He duplicated his father's way of standing with his hands in his pockets.
  3. to double; make twofold.
verb (used without object), du·pli·cat·ed, du·pli·cat·ing.
  1. to become duplicate.
  1. exactly like or corresponding to something else: duplicate copies of a letter.
  2. consisting of or existing in two identical or corresponding parts; double.
  3. Cards. noting a game in which each team plays a series of identical hands, the winner being the team making the best total score.
  1. in duplicate, in two copies, especially two identical copies: Please type the letter in duplicate.

Origin of duplicate

1400–50; late Middle English < Latin duplicātus (past participle of duplicāre to make double), equivalent to duplic- (stem of duplex) duplex + -ātus -ate1
Related formsdu·pli·ca·tive, adjectivenon·du·pli·cat·ing, adjectivenon·du·pli·ca·tive, adjectivepre·du·pli·cate, verb (used with object), pre·du·pli·cat·ed, pre·du·pli·cat·ing.qua·si-du·pli·cate, adjectiveself-du·pli·cat·ing, adjectiveun·du·pli·cat·ed, adjectiveun·du·pli·ca·tive, adjective

Synonyms for duplicate

1. facsimile, replica, reproduction. 4. See imitate. 9. twofold.

Antonyms for duplicate

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unduplicated

Contemporary Examples of unduplicated

Historical Examples of unduplicated

  • This fact heightens the probability that the unduplicated verses should also be assigned to some form of that document.

British Dictionary definitions for unduplicated


adjective (ˈdjuːplɪkɪt)
  1. copied exactly from an original
  2. identical
  3. existing as a pair or in pairs; twofold
noun (ˈdjuːplɪkɪt)
  1. an exact copy; double
  2. something additional or supplementary of the same kind
  3. two exact copies (esp in the phrase in duplicate)
verb (ˈdjuːplɪˌkeɪt)
  1. (tr) to make a replica of
  2. (tr) to do or make again
  3. (tr) to make in a pair; make double
  4. (intr) biology to reproduce by dividing into two identical partsthe chromosomes duplicated in mitosis
Derived Formsduplicable (ˈdjuːplɪkəbəl), adjectiveduplicability, nounduplicately, adverbduplicative, adjective

Word Origin for duplicate

C15: from Latin duplicāre to double, from duo two + plicāre to fold
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unduplicated



mid-15c., "having two parts, double," from Latin duplicatus, past participle of duplicare "to double," from duo "two" (see two) + plicare "to fold" see ply (v.1)). Meaning "exactly corresponding, that is an exact copy of" is from 1812.



1620s, "to double," from Latin duplicatus, past participle of duplicare (see duplicate (adj.)). Meaning "make an exact copy" is from 1640s (implied in duplicated). Related: Duplicating. The noun is first recorded 1530s.

Online Etymology Dictionary, © 2010 Douglas Harper