noun, plural sixties.
a cardinal number, ten times six.
a symbol for this number, as 60 or LX.
a set of this many persons or things.
sixties, the numbers, years, degrees, or the like, from 60 through 69, as in referring to numbered streets, indicating the years of a lifetime or of a century, or noting degrees of temperature: Her grandfather is in his late sixties. The temperature is in the low sixties.
amounting to 60 in number.
like sixty, Informal. with great speed, ease, energy, or zest: Everyone was working like sixty to finish up before the holidays.

before 900; Middle English (adj. and noun), Old English sixtig (adj.); cognate with Dutch zestig, German sechzig, Old Norse sextigir. See six, -ty1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sixty (ˈsɪkstɪ)
n , pl -ties
1.  See also number the cardinal number that is the product of ten and six
2.  a numeral, 60, LX, etc, representing sixty
3.  something represented by, representing, or consisting of 60 units
4.  a.  amounting to sixty: sixty soldiers
 b.  (as pronoun): sixty are dead
[Old English sixtig]

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. sixtig, from siex (see six) + -tig (see -ty (1)). Phrase sixty-four dollar question is 1942, from radio quiz show where that was the top prize. Sixty-nine in sexual sense is first attested 1888, as a transl. of Fr. faire soixante neuf, lit. "to do 69."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sixty years of government-funded basic research has set up a potential revolution in our approach to disease.
In accordance to his will, sixty beggars followed his casket.
Since then, sixty different newspapers and over thirty magazines have been published.
Sixty percent of the industry market belongs to food production.
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