air defense air cylinder • air-defiling · · · Info · Definitions · Characters · · air defense · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness. Synonyms: air defense. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 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