'Eighty' definitions:

Definition of 'eighty'

From: WordNet
adjective
Being ten more than seventy [syn: eighty, 80, lxxx, fourscore]
noun
The cardinal number that is the product of ten and eight [syn: eighty, 80, LXXX, fourscore]

Definition of 'Eighty'

From: GCIDE
  • Eighty \Eight"y\, 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]

Definition of 'Eighty'

From: GCIDE
  • Eighty \Eight"y\, n.
  • 1. The sum of eight times ten; eighty units or objects. [1913 Webster]
  • 2. A symbol representing eighty units, or ten eight times repeated, as 80 or lxxx. [1913 Webster]