eighteen Meaning, Definition & Usage

  1. noun the cardinal number that is the sum of seventeen and one
    18; XVIII.
  2. adjective satellite being one more than seventeen
    18; xviii.

WordNet

Eight"een` adjective
Etymology
AS. eahtatne, eahtatne. See Eight, and Ten, and cf. Eighty.
Definitions
  1. Eight and ten; as, eighteen pounds.
Eight"een` noun
Definitions
  1. The number greater by a unit than seventeen; eighteen units or objects.
  2. A symbol denoting eighteen units, as 18 or xviii.

Webster 1913