thirty-first

adjective

Definition of thirty-first

 (Entry 1 of 2)

1 : being number 31 in a countable series the thirty-first day — see Table of Numbers
2 : being one of 31 equal parts into which anything is divisible a thirty-first share of the money

thirty-first

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

1 : number 31 in a countable series the thirty-first of the month
2 : the quotient of a unit divided by 31 : one of 31 equal parts of anything one thirty-first of the total

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“Thirty-first.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thirty-first. Accessed 22 Jan. 2021.

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