an internal combustion engine, just like an automobile engine is

a powerful motor that propels a jet plane

a powerful motor that propels an airplane

a type of engine that uses a "jet" of air for thrust

An engine that works by creating a high- velocity jet of air to propel the engine forward.

1. Broadly, and engine that ejects a jet or stream of gas or fluid, obtaining all or most of its thrust by reaction to the ejection. See reaction engine. 2. Specifically, an aircraft engine that derives all or most of its thrust by reaction to its ejection of combustion products (or heated air) in a jet and that obtains oxygen from the atmosphere for the combustion of its fuel (or outside air for heating, as in the case of the nuclear jet engine), distinguished in this sense from a rocket engine. A jet engine of this kind may have a compressor, commonly turbine-driven, to take in and compress air (turbojet), or it may be compressorless, taking in and compressing air by other means ( pulsejet, ramjet).

A jet engine is an engine that discharges a fast moving jet of fluid to generate thrust in accordance with Newton's third law of motion. This broad definition of jet engines includes turbojets, turbofans, rockets and ramjets and water jets, but in common usage, the term generally refers to a gas turbine Brayton cycle engine used to produce a jet of high speed exhaust gases for special propulsive purposes. Jet engines are so familiar to the modern world that gas turbines are sometimes mistakenly referred to as a particular application of a jet engine, rather than the other way around.