twenty-one

• twenty one
• twentyone

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twenty-one

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

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

• twenty-first
• twenty-oneth

• twenty
• twenty-two

twenty-one (uncountable)

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.

• baccarat
• blackjack
• pontoon