irs irruptively • irtish · · · Info · Definitions · Characters · · irs · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) the bureau of the Treasury Department responsible for tax collections. Synonyms: Internal Revenue Service, IRS. · · Noun Definition 1 Characters · · i latin small letter i U+0069 r latin small letter r U+0072 s latin small letter s U+0073