A numerical value equal to 4; the number after three and before five; two plus two. This many dots (••••)
Describing a set or group with four elements.

The digit or figure 4; an occurrence thereof.
Anything measuring four units, as length.
Four o'clock.
A person who is four years old.
An event in which the batsmen run four times between the wickets or, more often, a batsman hits a ball which bounces on the ground before passing over a boundary, resulting in an award of 4 runs for the batting team. If the ball does not bounce before passing over the boundary, a six is awarded instead.
A power forward.
Four-man sweep racing shell, with or without a coxswain.
Four-man sweep racing shell, with or without a coxswain.
(colloquial) Four-man sweep racing shell, with or without a coxswain.
(obsolete) A four-pennyworth of spirits.