(idiomatic) A social class of wealthy people who travel for pleasure.

Relating to the life style of the jet set.

To follow the life style of the jet set.

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

(grammar) An established expression whose wording is subject to little or no variation, and which may or may not be idiomatic. / (grammar) An idiomatic expression in general.

(electronics) An early radio receiver, having no electrical power supply except the radio waves themselves; it used a crystal of lead or cadmium sulphide and a wire (the cat's whisker) touching the crystal's surface.

A screw with threads along the entire length and no head. Typically, set screws have a hex or slot drive recessed in the threaded length; a grub screw or worm screw.

(idiomatic) Permanent; certain; firm.

To render something permanent, certain, or firm.

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