cantus firmus

noun cantus fir·mus \-ˈfir-məs, -ˈfər-\

Definition of CANTUS FIRMUS

: 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; especially : one for contrapuntal treatment

Medieval Latin, literally, fixed song

First Known Use: 1847

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