thirty-first
noun1
One of thirty-one equal parts of a whole.
- A thirty-first of 620 is 20.
- Synonyms
- thirty-oneth
thirty-first
adj1
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.