selective service system selective service • selective-head · · · Info · Definitions · Characters · · selective service system · · Text Common · · Latin · · Scripts 24 · · Length 7 · · Syllables Definitions · · · (noun) an independent federal agency that administers compulsory military service. Synonyms: Selective Service, Selective Service System, SSS. · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D 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