A group or set of four persons or things.

A group of four. Obsolete. rare.

gen. A company or group of four persons or things. Obsolete.

A group or set of four persons or things; esp. a group of four persons or aspects seen as comprising the Christian Godhead (in contrast to the three…

= quaternion, n. (in various senses).

In extended use: a set of four things or people. Now rare.

A group of four things; = quaternion, n. 1. Obsolete. rare.

Originally: †the number four (obsolete). Later: a set of or group of four; a compound entity with four component parts. Now rare.

A sum, group, or set of four; four (things, etc.) regarded as a single object of thought.

gen. A set of four things or parts, esp. when occurring or working together.

Music. = quartet, n. 2a. Now archaic and rare.

A set of four persons. Obsolete.

A set of four things; esp. a series of four novels.

= quadruplet, n. (in various senses).