noun Etymology: Medieval Latin, literally, fixed song Date: 1847 the plainsong or simple Gregorian melody originally sung in unison and prescribed as to form and use by ecclesiastical tradition, a melodic theme or subject
CANTUS FIRMUS
Meaning of CANTUS FIRMUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012