adjective
coming next after the thirtieth in position
• Syn: ↑31st
• Similar to: ↑ordinal
* * *
I. \\| ̷ ̷ ̷ ̷| ̷ ̷\ adjective1. : being number 31 in a countable series
the thirty-first day
— see number table
2. : being one of 31 equal parts into which anything is divisible
a thirty-first share of the money
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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/therr"tee ferrst"/, adj.
1. next after the thirtieth; being the ordinal number for 31.
2. being one of 31 equal parts.
n.
3. a thirty-first part, esp. of one (1/31).
4. the thirty-first member of a series.
Useful english dictionary. 2012.