proliferate

[pruh-lif-uh-reyt]
verb (used without object), verb (used with object), proliferated, proliferating.
1.
to grow or produce by multiplication of parts, as in budding or cell division, or by procreation.
2.
to increase in number or spread rapidly and often excessively.

Origin:
1870–75; prolifer(ous) + -ate1

proliferative, adjective
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World English Dictionary
proliferate (prəˈlɪfəˌreɪt)
 
vb
1.  to grow or reproduce (new parts, cells, etc) rapidly
2.  to grow or increase or cause to grow or increase rapidly
 
[C19: from Medieval Latin prōlifer having offspring, from Latin prōlēs offspring + ferre to bear]
 
pro'liferative
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

proliferate
1873, as a term in biology, from proliferation. General sense from 1961.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

proliferate pro·lif·er·ate (prə-lĭf'ə-rāt')
v. pro·lif·er·at·ed, pro·lif·er·at·ing, pro·lif·er·ates
To grow or multiply by rapidly producing new tissue, parts, cells, or offspring.

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
The nuclei of the primitive sheath proliferate, and finally absorption of the
  axons and fatty substance occurs.
Social organizations proliferate but it is clear that they serve individual
  yearnings.
They'll only proliferate, and at an increasing rate worldwide.
Weapons proliferate, including explosives and rockets in unguarded piles.
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