pro·la·tion
| \ prōˈlāshən \
plural prolations
Definition of prolation
2
or prolatio, music
: the relationship between the semibreve and the minim in mensural notation
Note: In major prolation the semibreve is divided into three minims, whereas in minor prolation it is divided into two.
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Merriam-Webster unabridged
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Time Traveler for prolation
The first known use of prolation was in the 14th century
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