The word set, which has a multitude of definitions in the English language (464 separate definitions, according to the Oxford English Dictionary, making it one of the words with the highest number of definitions), may have any of the following meanings.

• Sets are a formalized notion of a collection of objects and are part of mathematics.
• Set (god) for the figure from ancient Egyptian mythology.
• Set (game) for the card game.
• Set (computer science) as datatype that is a collection of values.
• SET (secure electronic transaction) — a protocol for secure e-commerce.
• Set construction discusses dramatic settings for theatrical, movie and video production.
• Small appliance discusses appliances such as TV sets.
• Musical set theory for tone row, see collection for diatonic set theory.
• seṭ roots in Sanskrit grammar.