eighty Meaning, Definition & Usage

  1. noun the cardinal number that is the product of ten and eight
    LXXX; 80; fourscore.
  2. adjective satellite being ten more than seventy
    lxxx; 80; fourscore.

WordNet

Eight"y adjective
Etymology
AS. eahtatig, where the ending -tig is akin to English ten; cf. G. achtzig. See Eight, and Ten.
Definitions
  1. Eight times ten; fourscore.
Eight"y noun
Definitions
  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.

Webster 1913