pro·lif·er·a·tion

[pruh-lif-uh-rey-shuhn]
noun
1.
the growth or production of cells by multiplication of parts.
2.
a rapid and often excessive spread or increase: nuclear proliferation.

Origin:
1855–60; proliferate + -ion

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
proliferation (prəˌlɪfəˈreɪʃən) [Click for IPA pronunciation guide]
 
n
1.  rapid growth or reproduction of new parts, cells, etc
2.  rapid growth or increase in numbers
3.  a great number: done up in a proliferation of fancy frills

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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00:10
Proliferation is always a great word to know.
So is ninnyhammer. Does it mean:
a scrap or morsel of food left at a meal.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

proliferation
1867, "formation or development of cells," from Fr. proliferation, from prolifere "producing offspring," from L. proles "offspring" (see prolific) + ferre "to bear" (see infer). Meaning "enlargement, extension, increase" is from 1920; especially of nuclear weapons (1966).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

proliferation pro·lif·er·a·tion (prə-lĭf'ə-rā'shən)
n.
The growth and reproduction of similar cells.

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
Once again new technology has encouraged the proliferation of unauthorized
  music for next to nothing.
The proliferation of foreclosures has impinged on politics, too.
There was a proliferation of skepticism that was, ultimately, healthy.
Or the proliferation of artists, seduced more than a century ago by the
  mystical quality of the light.
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