eighty

noun

a cardinal number, ten times eight.

a symbol for this number, as 80 or LXXX.

a set of this many persons or things.

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

amounting to 80 in number.

Relevant Questions

How To Do Eighties Makeu...

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Eighty is always a great word to know.

So is callithumpian. Does it mean:

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To eighty

Collins

World English Dictionary

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

Now want has flipped one-eighty to imply an arbitrary and even whimsical

desire, unfettered by need, significance or logic.

Eighty-two percent of the animal's genes are found in other mammals.

The injunction may forestall calamity by keeping the wheels of industry turning

for an additional eighty days.

Eighty-five percent of the frogs were either missing limbs or had extra or

deformed ones.