trial balloon trial balance • trial brief · · · Info · Definitions · Characters · · trial balloon · · Text Common · · Latin · · Scripts 13 · · Length 3 · · Syllables Definitions · · · (noun) a test of public opinion. Synonyms: trial balloon. · · Noun Definition 1 (noun) a balloon sent up to test air currents. Synonyms: trial balloon. · · Noun Definition 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074