The property of being four in number.

Alternative spelling of twenty-four

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

(basketball, US, informal) The four regional champions of the NCAA Division I tournament, one of whom will become the national champion.

(algebraic geometry) Having four dimensions; being measurable along four mutually perpendicular axes.

Having four legs.

An animal that walks on four legs. / An intersection where two roads cross.

(idiomatic) On one's hands and knees. / (idiomatic, often followed by "with") In a manner which is similar in nature or effect to something else; consistently.

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

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