thirty-one

UK: ˈθɜːti wʌn | US: ˈθɜːrti wʌn

Definition

  1. adj. / n. the number 31, being one more than thirty

Structure
thirty <30>one <1>
Etymology

"Thirty" derives from Old English "þrītig," combining "þrīe" (three) and "-tig" (a suffix denoting multiples of ten). "One" comes from Old English "ān," meaning the numeral 1. The hyphenated form "thirty-one" follows the standard English pattern for compound numbers (21–99), where the tens and units are linked to form a single concept. This structure reflects the Germanic roots of English number formation.

Examples

  1. She celebrated her thirty-first birthday last week.

  2. The recipe calls for thirty-one grams of sugar.

  3. Page thirty-one contains the key diagram.

  4. He scored thirty-one points in the basketball game.

  5. The train departs at thirty-one minutes past the hour.