Definition of twenty-one in English:

twenty-one

Syllabification: twen·ty-one
Pronunciation: /ˌtwen(t)ēˈwən/

noun

The card game blackjack.

Definition of twenty-one in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude