fif·ty

[fif-tee] noun, plural fif·ties, adjective
noun
1.
a cardinal number, ten times five.
2.
a symbol for this number, as 50 or L.
3.
a set of this many persons or things.
4.
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.
5.
Informal. a fifty-dollar bill: He had a fifty and two tens in his wallet.
adjective
6.
amounting to 50 in number.
00:10
Fifty is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.

Origin:
before 900; Middle English; Old English fīftig. See five, -ty1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
fifty (ˈfɪftɪ) [Click for IPA pronunciation guide]
 
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
 
determiner
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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Etymonline
Word Origin & History

fifty
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 students, or about a fifth of those surveyed, met the authors' criteria
  for addiction to indoor tanning.
And so, fifty years after the end of colonialism, the nation seems finally to
  be coming into its own.
Nevertheless, there have between fifty to eighty students enrolling each year.
Fifty-three percent said they didn't think hearing protection was needed.
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