eighty

[ey-tee]
noun, plural eighties.
1.
a cardinal number, ten times eight.
2.
a symbol for this number, as 80 or LXXX.
3.
a set of this many persons or things.
4.
eighties, the numbers, years, degrees, or the like, from 80 through 89, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature.
adjective
5.
amounting to 80 in number.

Origin:
before 850; Middle English eighteti, Old English eahtatig. See eight, -ty1

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eighty (ˈeɪtɪ)
 
n , pl -ies
1.  See also number the cardinal number that is the product of ten and eight
2.  a numeral, 80, LXXX, etc, representing this number
3.  (plural) the numbers 80--89, esp a person's age or the year of a particular century
4.  the amount or quantity that is eight times as big as ten
5.  something represented by, representing, or consisting of 80 units
 
determiner
6.  a.  amounting to eighty: eighty pages of nonsense
 b.  (as pronoun): eighty are expected
 
[Old English eahtatig; related to Old Frisian achtig, Old High German ahtozug]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

eighty
O.E. hundeahtatig, with from hund- "ten." See eight + -ty (1). Modern form attested by late 13c. Eighties in reference to a decade of years is recorded from 1883.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Eighty percent of the lava was produced during a single pulse of eruptions, she
  added.
Eighty-seven percent of the peninsula's glaciers have been retreating during
  the same period, he added.
Eighty-six adult pandas have also been confirmed safe.
See tractors and other farm equipment spanning the last eighty years.
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