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Twenty-one (Noun)

The cardinal number that is the sum of twenty and one.

Nouns denoting quantities and units of measure.

She turned twenty-one years old last Friday and is now legally allowed to drink in her state.
Twenty-one players are required to start a standard game of Australian Rules football.
He scored twenty-one points in the first half of the basketball game.
The blackjack player's total hand value was twenty-one, which meant he won the game.
The local police department is recruiting twenty-one new officers to fill open positions.

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.

Nouns denoting acts or actions.

The player's hand value was twenty-one, so they immediately won the game.
In blackjack, the goal is to get a hand value closest to twenty-one without going over.
The dealer's upcard was a ten, so the player tried to get twenty-one with their next card.
With a nine and a five, the player had a total of fourteen and needed seven more to reach twenty-one.
The player was dealt a ten and an ace, giving them a total of twenty-one and a strong chance of winning.