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eighty-first

adjective

Definition of eighty-first 

(Entry 1 of 2)

1 : being number 81 in a countable series the eighty-first day — see Table of Numbers

2 : being one of 81 equal parts into which something is divisible an eighty-first share of the money

eighty-first

noun
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Definition of eighty-first (Entry 2 of 2)

1 : number 81 in a countable series

2 : the quotient of a unit divided by 81 : one of 81 equal parts of something one eighty-first of the total

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