[doo-pli-key-shuh n, dyoo-]


an act or instance of duplicating.
the state of being duplicated.
Genetics. a type of chromosomal aberration in which a region of the chromosome is repeated.

Origin of duplication

1490–1500; (< Anglo-French) < Latin duplicātiōn- (stem of duplicātiō), equivalent to duplicāt(us) (see duplicate) + -iōn- -ion
Related formsnon·du·pli·ca·tion, nounpre·du·pli·ca·tion, nounself-du·pli·ca·tion, nounsu·per·du·pli·ca·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for duplication

Contemporary Examples of duplication

  • Recommendations from the Government Accountability Office on reducing waste and duplication need to be enforced, not ignored.

    The Daily Beast logo
    A 9-Point Plan to Fix the Debt, for Good

    Mark McKinnon

    January 13, 2013

  • Superimposing the route maps of United and Continental shows an extraordinary amount of duplication.

    The Daily Beast logo
    Bad News for Fliers

    Clive Irving

    April 30, 2010

Historical Examples of duplication

British Dictionary definitions for duplication



the act of duplicating or the state of being duplicated
a copy; duplicate
genetics a mutation in which there are two or more copies of a gene or of a segment of a chromosome
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 duplication

early 15c., "doubling," from Middle French duplicacion (13c.) and directly from Latin duplicationem (nominative duplicatio), noun of action from past participle stem of duplicare (see duplicate (adj.)). Meaning "repetition" is from 1580s.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for duplication




The existence or growth into two corresponding parts.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.