Alternative spelling of set-theoretic

To depart on a voyage by boat.

Alternative spelling of downset

(underwater diving) The set of equipment required by a scuba diver to be at ease when submerged for extended periods of time. Modern equipment sets include tanks containing mixes of nitrogen in varied ratios with oxygen, a buoyancy control device, a first- and second-stage regulator (to allow the regulated flow of gas from the tank into the user's respiratory system), a wetsuit and accessories for heat insulation, fins for underwater propulsion, a mask (to see underwater), and a snorkel (for moving around the surface of the water without using up breathing gas). Many divers also choose to dive with a diving knife (in case of a tangle with a net, etc.), and night divers may also dive with a waterproof flashlight.

(computing) The set of machine instructions that a particular CPU can execute; the corresponding set of assembly language mnemonics.

(intransitive, followed by to) To light using fire; to cause to be on fire; to set alight.

A collection of drums and other percussion instruments designed to be played together.

(mathematics) The set of all the edges of a graph

plural of set square

(idiomatic) To trigger movement or progress; to get going.