[doo-pli-key-shuhn, 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.

1490–1500; (< Anglo-French) < Latin duplicātiōn- (stem of duplicātiō), equivalent to duplicāt(us) (see duplicate) + -iōn- -ion

nonduplication, noun
preduplication, noun
self-duplication, noun
superduplication, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
duplication (ˌdjuːplɪˈkeɪʃən)
1.  the act of duplicating or the state of being duplicated
2.  a copy; duplicate
3.  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 10th Edition
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Word Origin & History

early 15c., from Fr. duplication (13c.), from L. duplicationem, noun of action from duplicare (see duplicate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

duplication du·pli·ca·tion (dōō'plĭ-kā'shən, dyōō'-)
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.
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Example sentences
By the time you've collected a hundred or so, you can use the rate of
  duplication to estimate the total number of cards.
To better understand this range and avoid duplication of earlier contests,
  check out the archive of previous contests.
Biologically, all future organization has grown out of it, by a process of
  duplication and interrelationship.
Wasteful duplication and proliferation of lines could easily result if there
  were no public regulation.
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