- a cardinal number, three plus one.
- a symbol of this number, 4 or IV or IIII.
- a set of this many persons or things.
- a playing card, die face, or half of a domino face with four pips.
- alternate four-bar passages, as played in sequence by different soloists: with guitar and piano trading fours.
- Automotive.
- an automobile powered by a four-cylinder engine.
- the engine itself.
- amounting to four in number.
- the cardinal number that is the sum of three and one
- a numeral, 4, IV, etc, representing this number
- something representing, represented by, or consisting of four units, such as a playing card with four symbols on it
- four hours after noon or midnight
- cricket
- a shot that crosses the boundary after hitting the ground
- the four runs scored for such a shot
- rowing
- a racing shell propelled by four oarsmen pulling one oar each, with or without a cox
- the crew of such a shell
- amounting to four
- (as pronoun)
