Twenty-one

Pronunciation

Alternative forms

• twenty one
• twentyone

Numeral

numeral

1. The cardinal number occurring after twenty and before twenty-two, represented in Roman numerals as XXI and in Arabic numerals as 21.

Synonyms

• one and twenty
• Arabic numerals: 21
• Roman numerals: XXI

Derived terms

• twenty-first
• twenty-oneth

Full definition of twenty-one

Noun

1. (card games) Blackjack.
• 1978, Lawrence Durrell, Livia, Faber & Faber 1992 Avignon Quintet, p. 398:They were to spend many an evening together sitting round the old kitchen table playing twentyone ....
2. (sports) A basketball-based game in which players attempt to score exactly twenty-one points.