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eight·i·eth

eightieth

 
pronunciation:
eI ti ihth
parts of speech:
adjective, noun
part of speech: adjective
definition: coming next after the seventy-ninth in a series.
She won the basketball game by scoring the eightieth point.
 
part of speech: noun
definition 1: one of eighty equal parts of a whole; 1/80.
If each student does an eightieth of the work, we'll have it done in no time.
definition 2: the number, person, or thing that comes next after the seventy-ninth in a series.
There was no better birthday than her eightieth.