In a way that is favorable to one.

The cardinal number immediately following thirty and before thirty-two; thirty plus one.

(US) One thousand plus one.

None at all.

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

(card games) Blackjack. / (sports) A basketball-based game in which players attempt to score exactly twenty-one points.

The cardinal number following eighty and preceding eighty-two.

The number 100.

Used in a common chronometric counting scheme, in which each iteration is sequentially numbered and supposed to be approximately one second in length.

The number 1000.