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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.


2 [muhl-tuh-plee]
in several or many ways; in a multiple manner; manifoldly.

1880–85; multiple + -ly

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
multiple (ˈmʌltɪpəl)
1.  having or involving more than one part, individual, etc: he had multiple injuries
2.  (US), (Canadian) electronics (of a circuit) having a number of conductors in parallel
3.  the product of a given number or polynomial and any other one: 6 is a multiple of 2
4.  telephony an electrical circuit accessible at a number of points to any one of which a connection can be made
5.  short for multiple store
[C17: via French from Late Latin multiplus, from Latin multiplex]

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
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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
If those claims multiply or rise in price, that does not mean aggregate wealth
  has increased.
Still, there is a population here that can thrive-and multiply if protected.
The same goes for mild infections of beneficial helminths that can't multiply
  inside humans.
The wort acts as a food source for the yeast to feed upon and multiply.
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