complex sentence complex quantity • complexus · · · Info · Definitions · Characters · · complex sentence · · Text Common · · Latin · · Scripts 16 · · Length 4 · · Syllables Definitions · · · (noun) a sentence composed of at least one main clause and one subordinate clause. Synonyms: complex sentence. · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 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 p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074 x latin small letter x U+0078