(idiomatic) Perfect understanding of events only after they have happened.

Alternative spelling of twenty-one

Alternative spelling of twenty-four

The cardinal number occurring after twenty one and before twenty three, represented in Roman numerals as XXII and in Arabic numerals as 22. Ordinal: twenty-second.

The cardinal number after twenty-two and before twenty-four.

The cardinal number immediately following twenty-six and preceding twenty-eight.

The cardinal number immediately following twenty-three and preceding twenty-five.

The cardinal number immediately following twenty-five and preceding twenty-seven.

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.