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eightieth

adjective

  1. preceded by seventy-nine others in a series; 80th
  2. designating any of the eighty equal parts of something

noun

  1. the one following the seventy-ninth
  2. any one of the eighty equal parts of something;

adverb

in the eightieth place, rank, group, etc.

See eightieth in American Heritage Dictionary 4

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