plainsong plainsoled • plainspoken · · · Info · Definitions · Synonyms · Characters · · plainsong · · Text Latin · · Script 9 · · Length 2 · · Syllables Definitions · · · (noun) a liturgical chant of the Roman Catholic Church. Synonyms: plainchant, Gregorian chant. · · Noun Definition 1 Synonyms · · · plainchant · · Synonym 1 gregorian chant · · Synonym 2 Characters · · a latin small letter a U+0061 g latin small letter g U+0067 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 s latin small letter s U+0073