two times, as in succession: Write twice a week.
on two occasions; in two instances: I phoned him twice.
in twofold quantity or degree; in double the amount or degree: twice as much.

before 1150; Middle English twies, equivalent to twie twice (Old English twige, cognate with Old Frisian twīa, Old Saxon tuuīo; see twi-) + -s -s1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
twice (twaɪs)
1.  two times; on two occasions or in two cases: he coughed twice
2.  double in degree or quantity: twice as long
[Old English twiwa; related to Old Norse tvisvar, Middle Low German twiges]

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

late O.E. twiga, twigea "two times" (cognate with O.Fris. twia, O.S. tuuio) + adverbial genitive ending -es.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see cheap at twice the price; lightning never strikes twice; once bitten, twice shy; think twice.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Oh, for the chance to go back and relive the past and not make the same mistake
To create two-tone pops, make two different recipes and use twice as many molds.
Though lawns do need lots of water, many gardeners are too generous, often
  providing twice the amount the lawn really needs.
Sleigh rides are offered twice a week, and there's a hoot-and-holler of a
  tubing run with big banked turns.
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