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
Fifty finalists will be selected, ten for each of the five categories.
We learned that they can carry fifty percent of their weight.
Fifty white students are crowded into a too-tight circle.
Fifty-seven percent of students who never use e-books say it is because they
  don't know where to find them.
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