[twen-tee, twuhn-]
noun, plural twenties.
a cardinal number, 10 times 2.
a symbol for this number, as 20 or XX.
a set of this many persons or things.
Informal. a twenty-dollar bill: Can you give me two tens for a twenty?
twenties, the numbers, years, degrees, or the like, from 20 through 29, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature: He lives in the West Twenties. She's in her early twenties. The temperature must be in the high twenties today.
amounting to 20 in number.

before 900; Middle English; Old English twēntig; cognate with Old Frisian tw(e)intich, Old High German zweinzug (German zwanzig), Gothic twai tigjus two tens Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
twenty (ˈtwɛntɪ)
n , pl -ties
1.  See also number the cardinal number that is the product of ten and two; a score
2.  a numeral, 20, XX, etc, representing this number
3.  something representing, represented by, or consisting of 20 units
4.  a.  amounting to twenty: twenty questions
 b.  (as pronoun): to order twenty
Related: vicenary, vigesimal, icosa-
[Old English twēntig; related to Old High German zweinzug, German zwanzig]

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

O.E. twentig "group of twenty," from twegen "two" (see two) + -tig "group of ten" (see -ty (1)). Cognate with O.Fris. twintich, Du. twintig, O.H.G. zweinzug, Ger. zwanzig. Goth. twai tigjus is even more transparent: lit. "two tens." Twentieth is O.E.
twentigoða. The card game twenty-one (1790) is from Fr. vingt-et-un (1781). Twenty-twenty hindsight is first recorded 1962, a fig. use of the Snellen fraction for normal visual acuity, expressed in feet. The guessing game of twenty questions is recorded from 1786. The Twentieth Century Limited was an express train from New York to Chicago 1902-1967.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for twenties
Nouveau riches in the roaring twenties established large estates on the north shore.
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