cantus firmus
noun
cantus fir·mus
| \ -ˈfir-məs
, -ˈfər-\
, -ˈfər-\
Definition of cantus firmus
1
: the plainsong or simple Gregorian melody originally sung in unison and prescribed as to form and use by ecclesiastical tradition
2
: a melodic theme or subject
especially
: one for contrapuntal treatment
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