A set of things is a number of things that belong together or that are thought of as a group.

In tennis, a set is one of the groups of six or more games that form part of a match.

In mathematics, a set is a group of mathematical quantities that have some characteristic in common.

A band's or musician's set is the group of songs or tunes that they perform at a concert.

You can refer to a group of people as a set if they meet together socially or have the same interests and lifestyle.

The set for a play, film, or television show is the furniture and scenery that is on the stage when the play is being performed or in the studio where filming takes place.

The set of someone's face or part of their body is the way that it is fixed in a particular expression or position, especially one that shows determination.

A set is an appliance. For example, a television set is a television.