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1

ninety-first

adjective

Definition of ninety-first

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

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2

ninety-first

noun \ " \

Definition of ninety-first

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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