eightieth Meaning, Definition & Usage

  1. noun position 80 in a countable series of things
  2. adjective satellite the ordinal number of eighty in counting order
    80th.

WordNet

Eight"i*eth adjective
Etymology
From Eighty.
Definitions
  1. The next in order after seventy-ninth.
  2. Consisting of one of eighty equal parts or divisions.
Eight"i*eth noun
Definitions
  1. The quotient of a unit divided by eighty; one of eighty equal parts.

Webster 1913