noun, plural fifties.
a cardinal number, ten times five.
a symbol for this number, as 50 or L.
a set of this many persons or things.
fifties, the numbers, years, degrees, or the like, from 50 through 59, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature: She lives in the East Fifties. He's in his late fifties. It's going to be in the fifties again today.
Informal. a fifty-dollar bill: He had a fifty and two tens in his wallet.
amounting to 50 in number.

before 900; Middle English; Old English fīftig. See five, -ty1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fifty (ˈfɪftɪ)
n , pl -ties
1.  the cardinal number that is the product of ten and five
2.  a numeral, 50, L, etc, representing this number
3.  something represented by, representing, or consisting of 50 units
4.  a.  amounting to fifty: fifty people
 b.  (as pronoun): fifty should be sufficient
[Old English fīftig]

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

O.E. fiftig, from fif "five" + -tig "group of ten." (cf. O.N. fimm tigir, Du. vijftig, Ger. fünfzig). U.S. colloquial fifty-fifty "in an even division" is from 1913.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for fifties
By the late fifties, poultry production had changed dramatically.
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