| jet engine [¦jet ¦en·jǝn] AEROSPACE ENGINEERING 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. MECHANICAL ENGINEERING Any engine that ejects a jet or stream of gas or fluid, obtaining all or most of its thrust by reaction to the ejection. |