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triplum

triplum Mus.
  (ˈtrɪplʊm)
  Pl. tripla.
  [med.L., neut. of triplus triple a.; cf. treble n. 4.]
  In thirteenth- and fourteenth-century polyphonic vocal music, the third voice part, next but one above the tenor.

1782, 1884 [see treble n. 4]. 1944 W. Apel Harvard Dict. Mus. 223/1 Triplum, quadruplum are other parts above the tenor, frequently of the same range as the duplum. 1954 New Oxf. Hist. Music II. xi. 354 The motet ‘Salve virgo virginum/Est il donc ainsi/Aptatur’ has 202 notes in the triplum (highest voice), 173 in the motetus (middle voice), and only 103 in the tenor. 1977 Early Music Apr. 185 A glance through the tripla and dupla of 13th-century motets is enough to show that rhythmic styles could be tolerated in music which made a nonsense of poetic scansion.

Oxford English Dictionary

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