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
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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
Dictionary Entries Near thirty-first
Cite this Entry
“Thirty-first.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thirty-first. Accessed 7 Dec. 2023.
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