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Definition of Thirty-first
1. Adjective. Coming next after the thirtieth in position.
Definition of Thirty-first
1. Numeral. (ordinal) The ordinal form of the number thirty-one, describing a person or thing in position number 31 of a sequence. ¹
2. Noun. (fractional) One of thirty-one equal parts of a whole. ¹
¹ Source: wiktionary.com