EIGHTY
eighty, lxxx, fourscore
(adjective) being ten more than seventy
eighty, LXXX, fourscore
(noun) the cardinal number that is the product of ten and eight
Source: WordNet® 3.1
Etymology
Numeral
eighty
The cardinal number occurring after seventy-nine and before eighty-one, represented in Roman numerals as LXXX and in Arabic numerals as 80.
Source: Wiktionary
Eight"y, a. Etym: [AS. eahtatig, where the ending -tig is akin to
English ten; cf. G. achtzig. See Eight, and Ten.]
Definition: Eight times ten; fourscore.
Eight"y, n.
1. The sum of eight times ten; eighty units or objects.
2. A symbol representing eighty units, or ten eight times repeated,
as 80 or lxxx.
Source: Webster’s Unabridged Dictionary 1913 Edition