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ninetieth

adjective

  1. preceded by eighty-nine others in a series; 90th
  2. designating any of the ninety equal parts of something

noun

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

adverb

in the ninetieth place, rank, group, etc.

See ninetieth in American Heritage Dictionary 4

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