Thirty-first

Adjective

adjective

1. The ordinal form of the number thirty-one, describing a person or thing in position number 31 of a sequence.The answer appears on the thirty-first page of the book.She finished thirty-first in the race.

Usage notes

English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.

Abbreviations

• 31st, 31

Full definition of thirty-first

Noun

1. One of thirty-one equal parts of a whole.A thirty-first of 620 is 20.

Synonyms

• thirty-oneth