active agent active • active air defense · · · Info · Definitions · Synonyms · Characters · · active agent · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) chemical agent capable of activity. Synonyms: active agent, active. · · Noun Definition 1 Synonyms · · · active · · 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 t latin small letter t U+0074 v latin small letter v U+0076