reaction engine reaction border • reaction formation · · · Info · Definitions · Synonyms · Characters · · reaction engine · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream. Synonyms: reaction-propulsion engine, reaction engine. · · Noun Definition 1 Synonyms · · · reaction-propulsion engine · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074