A number of related things occurring in order or succession.

• A set of connected things of a similar kind.

A television or radio show made up of multiple episodes.

• Sometimes, one season of such a show.

The sum of terms of a sequence, often infinite.

• The sequence of partial sums of a sequence.

A set of games between the same opponents to decide a winner.

Botany: a rank below section and above species.

• Also, an unranked grouping of related species.

A set of consonants sharing a particular phonetic feature.