Real Dictionary

jet
A jet is an aircraft that is powered by jet engines.
countable noun: A jet of liquid or gas is a strong, fast, thin stream of it.
verb: If you jet somewhere, you travel there in a fast plane.

jet in American English 1
a stream of liquid or gas emitted or forced out, as from a spout
to spout, gush, or shoot out in a stream, as liquid or gas
noun: a stream of a liquid, gas, or small solid particles forcefully shooting forth from a nozzle, orifice, etc

jet in American English 2
a hard, black variety of lignite, which takes a high polish: sometimes used in jewelry
made of jet
adjective: consisting or made of jet
noun: a compact black coal, susceptible of a high polish, used for making beads, jewelry, buttons, etc

jet in Automotive Engineering
noun: A jet is a hole through which liquid can pass at a controlled rate, as in a carburetor.

JET in British English
noun acronym for: Joint European Torus; a tokamak plasma-containment device at Culham, Oxfordshire, for research into energy production by nuclear fusion

jet in British English 1
noun: a thin stream of liquid or gas forced out of a small aperture or nozzle
verb: to issue or cause to issue in a jet

jet in British English 2
noun: a hard black variety of coal that takes a brilliant polish and is used for jewellery, ornaments, etc