fifth column fifth avenue • fifth columnist · · · Info · Definitions · Synonyms · Characters · · fifth column · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst. Synonyms: fifth column, Trojan horse. · · Noun Definition 1 Synonyms · · · trojan horse · · Synonym 1 Characters · · space U+0020 c latin small letter c U+0063 f latin small letter f U+0066 h latin small letter h U+0068 i latin small letter i U+0069 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 t latin small letter t U+0074 u latin small letter u U+0075