quadruple

[kwo-droo-puhl, -druhp-uhl, kwod-roo-puhl]
adjective
1.
fourfold; consisting of four parts: a quadruple alliance.
2.
four times as great.
3.
Music. having four beats to a measure.
noun
4.
a number, amount, etc., four times as great as another.
5.
something, as a series of acrobatic somersaults, made up of four clearly defined parts or stages: the first trapeze artist to perform a quadruple successfully.
verb (used with object), verb (used without object), quadrupled, quadrupling.
6.
to make or become four times as great: To serve 24 people, quadruple the recipe. My savings quadrupled in 20 years.

Origin:
1325–75; Middle English < Latin quadruplus; cf. quadru-, duple

quadrupleness, noun
quadruply, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quadruple (ˈkwɒdrʊpəl, kwɒˈdruːpəl)
 
vb
1.  to multiply by four or increase fourfold
 
adj
2.  four times as much or as many; fourfold
3.  consisting of four parts
 
n
4.  a quantity or number four times as great as another
 
[C16: via Old French from Latin quadruplus, from quadru- (see quadri-) + -plus -fold]
 
'quadruply
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

quadruple
late 14c., from L. quadruplare "make fourfold," from quadruplus (n.) "quadruple," from quadri- "four" + -plus "fold." Quadruplets "four children in one birth" is first recorded 1787. The abbreviation of it to quad is first attested 1851.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Meanwhile, line a large fine-mesh metal colander with a quadruple thickness of cheesecloth and set in sink.
The quadruple summits, with their modest potential, are unlikely to improve things much.
Quadruple the number of faculty members have volunteered to meet with
  prospective students.
Will they double do you think or quadruple under the regulatory regime you wish
  to implement.
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