1 [muhl-tuh-plahy]
verb (used with object), multiplied, multiplying.
to make many or manifold; increase the number, quantity, etc., of.
Arithmetic. to find the product of by multiplication.
to breed (animals).
to propagate (plants).
to increase by procreation.
verb (used without object), multiplied, multiplying.
to grow in number, quantity, etc.; increase.
Arithmetic. to perform the process of multiplication.
to increase in number by procreation or natural generation.

1225–75; Middle English multiplien < Old French multiplier < Latin multiplicāre. See multi-, ply2

self-multiplied, adjective
self-multiplying, adjective
unmultiplied, adjective
unmultiplying, adjective

6. magnify, enlarge, intensify. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
multiply (ˈmʌltɪˌplaɪ)
vb , -plies, -plying, -plied
1.  to increase or cause to increase in number, quantity, or degree
2.  (tr) to combine (two numbers or quantities) by multiplication
3.  (intr) to increase in number by reproduction
[C13: from Old French multiplier, from Latin multiplicāre to multiply, from multus much, many + plicāre to fold]

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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Word Origin & History

mid-12c., "to cause to become many," from O.Fr. multiplier, from L. multiplicare "to increase," from multiplex (gen. multiplicis) "having many folds, many times as great in number," from multi- "many" + base of plicare "to fold" see ply (v.)). Mathematical sense is attested
from late 14c. Related: Multiplier.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

multiply mul·ti·ply (mŭl'tə-plī')
v. mul·ti·plied, mul·ti·ply·ing, mul·ti·plies

  1. To increase the amount, number, or degree of.

  2. To breed or propagate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
multiply   (mŭl'tə-plī')  Pronunciation Key 
To perform multiplication on a pair of quantities.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The guess is then that fraction multiplied by the number of airplanes in, say,
  the current ten- or fifteen-minute window.
But some of the viruses adapted to evade the defenders, sickened their host
  mice, and multiplied in number.
Your faults and weaknesses as a human being are amplified in a poker game, and
  your strengths are multiplied as well.
The only difference is, our population has multiplied, and graduate departments
  have grown accordingly.
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