internal revenue service internal revenue agent • internal rhyme · · · Info · Definitions · Characters · · internal revenue service · · Text Common · · Latin · · Scripts 24 · · Length 8 · · Syllables Definitions · · · (noun) the bureau of the Treasury Department responsible for tax collections. Synonyms: Internal Revenue Service, IRS. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C 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 u latin small letter u U+0075 v latin small letter v U+0076