(computing) A file of related records on a computer-readable medium such as disk, especially one on a mainframe computer; a dataset.

(set theory, of a set S) The set whose elements comprise all the subsets of S (including the empty set and S itself).

(mathematics, measure theory) A negligible set; set of zero measure. / (set theory) The empty set.

(mathematics, set theory, measure theory) A set that is small enough that it can be ignored for some purpose.

(transitive) To separate and reserve something for a specific purpose. / (transitive) To leave out of account; to omit or neglect. / (transitive) To disagree with something and reject or overturn it.

(mathematics) The mathematical theory of sets. / (music) Musical set theory, a systematic approach to describing musical objects and their relationships.

(transitive) To delay or obstruct. / (transitive) To remove from or allow distance. / (transitive) To install or position behind a boundary or surface, or in a recess.

(set theory) A set large enough to contain all sets under consideration in the current context.

To select (something or someone) for a specific purpose. / To distinguish, make obvious the distinction between (two things) or of (something).

To initiate or begin some action. / To attack.