Princeton's WordNet

1. eightieth(adj)

   position 80 in a countable series of things

2. eightieth, 80th(adj)

   the ordinal number of eighty in counting order

Wiktionary

1. eightieth(Noun)

   The person or thing in the eightieth position.

2. eightieth(Noun)

   One of eighty equal parts of a whole.

3. eightieth(Adjective)

   The ordinal form of the number eighty.

Webster Dictionary

1. Eightieth(adj)

   the next in order after seventy-ninth

2. Eightieth(adj)

   consisting of one of eighty equal parts or divisions

3. Eightieth(noun)

   the quotient of a unit divided by eighty; one of eighty equal parts

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