noun, num ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   Blackjack. uncountable

   "They were to spend many an evening together sitting round the old kitchen table playing twentyone …."

2. 2
   a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 wordnet
3. 3
   A basketball-based game in which players attempt to score exactly twenty-one points. uncountable
4. 4
   the cardinal number that is the sum of twenty and one wordnet

Adjective

1. 1
   being one more than twenty wordnet

Numeral

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

Synonyms

All synonyms

212121blackjackbridgeeleventeen

Example

More examples

"The tower is three hundred and twenty-one meters high."

Related phrases

twenty-first

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.