Eighty

• POS: Definite Article, Noun
• HYPHEN: eight=y

CIDE DICTIONARY

Eighty, a. [AS. eahtatig, where the ending -tig is akin to English ten; cf. G. achtzig. See Eight, and Ten.].

 Eight times ten; fourscore.  [1913 Webster]

Eighty, n. 

•  The sum of eight times ten; eighty units or objects.  [1913 Webster]
•  A symbol representing eighty units, or ten eight times repeated, as 80 or lxxx.  [1913 Webster]

OXFORD DICTIONARY

Eighty, n. & adj.
--n. (pl. -ies)
1 the product of eight and ten.
2 a symbol for this (80, lxxx, LXXX).
3 (in pl.) the numbers from
80 to 89, esp. the years of a century or of a person's life.
--adj. that amount to eighty.

Idiom

eighty-first, -second , etc. the ordinal numbers between eightieth and ninetieth. eighty-one, -two , etc. the cardinal numbers between eighty and ninety.

Derivative

eightieth adj. & n. eightyfold adj. & adv.

Etymology

OE -eahtatig (as EIGHT, -TY(2))

ROGET THESAURUS

Eighty

Five

N five, five, cinque, quint, quincux, six, half-a- dozen, half dozen, seven, eight, nine, three times three, dicker, ten, decade, eleven, twelve, dozen, thirteen, long dozen, baker's dozen, quintuplet, twenty, score, twenty-four, four and twenty, two dozen, twenty-five, five and twenty, quarter of a hundred, forty, two score, fifty, half a hundred, sixty, three score, seventy, three score and ten, eighty, four score, ninety, fourscore and ten, sestiad, hundred, centenary, hecatomb, century, hundredweight, cwt, one hundred and forty-four, gross, thousand, chiliad, millennium, thousand years, grand, myriad, ten thousand, ban, man, ten thousand years, banzai, lac, one hundred thousand, plum, million, thousand million, milliard, billion, trillion, five, quinary, quintuple, fifth, senary, sextuple, sixth, seventh, septuple, octuple, eighth, ninefold, ninth, tenfold, decimal, denary, decuple, tenth, eleventh, duodenary, duodenal, twelfth, in one's 'teens, thirteenth, vicesimal, vigesimal, twentieth, twenty-fourth, vicenary, vicennial, centuple, centuplicate, centennial, centenary, centurial, secular, hundredth, thousandth.