Four vs. Quaternity — What's the Difference?

The cardinal number equal to 3 + 1.

(countable) A group or set of four.

The fourth in a set or sequence.

(uncountable) The state of being four.

Something having four parts, units, or members, such as a musical quartet or a four-cylinder engine.

The number four.

A numerical value equal to 4; the number after three and before five; two plus two. This many dots (••••)

The union of four in one, as of four persons; - analogous to the theological term trinity.

Describing a set or group with four elements.

The cardinal number that is the sum of three and one

(countable) The digit or figure 4; an occurrence thereof.

(countable) Anything measuring four units, as length.

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.

(rowing) Four-man sweep racing shell, with or without a coxswain.

The shell itself.

The crew rowing in a four boat.

(colloquial) A regatta event for four boats.

(obsolete) A four-pennyworth of spirits.

One more than three; twice two.

The sum of four units; four units or objects.

A symbol representing four units, as 4 or iv.

Four things of the same kind, esp. four horses; as, a chariot and four.

The cardinal number that is the sum of three and one

Being one more than three