Definition of ninety-first
(Entry 1 of 2)
1 : being number 91 in a countable series
the ninety-first day — see Table of Numbers
2 : being one of 91 equal parts into which something is divisible
a ninety-first share of money
ninety-first
noun\ " \
Definition of ninety-first (Entry 2 of 2)
1 : number 91 in a countable series
2 : the quotient of a unit divided by 91 : one of 91 equal parts of something
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