inertial navigation system inertial navigation • inertial reference frame · · · Info · Definitions · Synonyms · Characters · · inertial navigation system · · Text Common · · Latin · · Scripts 26 · · Length 9 · · Syllables Definitions · · · (noun) a system to control a plane or spacecraft; uses inertial forces. Synonyms: inertial guidance system, inertial navigation system. · · Noun Definition 1 Synonyms · · · inertial guidance system · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076 y latin small letter y U+0079