quartet

A composition for four voices or four instruments.

A group of four singers or four instrumentalists.

A group of four.

In embryology, a group of four cleavage-cells considered as a unit, either because they arise at the same time, or because they have a similar origin or prospective function.

In music: A composition or movement for four solo parts, either vocal or instrumental, usually without accompaniment.

A company of four singers or players who perform quartets.

In an orchestra the stringed instruments collectively, and in oratorio music the principal vocal soloists, are sometimes loosely called the quartet.

A stanza of four lines.

Same as quadruplet.