1、To sing a plainsong intonation.
2、a type of music that is termed plainsong
3、The opening phrase of a plainsong composition sung as a solo part.
4、A single tone repeated with different words or time values, as in plainsong.
5、A plainsong melody serving as the basis of a polyphonic composition by the addition of contrapuntal voices, as in 5th-century polyphony.
