proportional tax proportional sampling • proportionate · · · Info · Definitions · Characters · · proportional tax · · Text Common · · Latin · · Scripts 16 · · Length 5 · · Syllables Definitions · · · (noun) any tax in which the rate is constant as the amount subject to taxation increases. Synonyms: proportional tax. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 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 p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 x latin small letter x U+0078