active air defense active agent • active application · · · Info · Definitions · Characters · · active air defense · · Text Common · · Latin · · Scripts 18 · · Length 5 · · Syllables Definitions · · · (noun) air defense by the use aircraft or missiles or artillery or electronic countermeasures. Synonyms: active air defense. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E 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