TEMPUS
Text: Time, one of the three early divisions of mensurable music, which were: (1) Mode: Modus was the division of a maxim into longs, or of a long into breves; (2) Time: Tempus was the division of a breve into semibreves; (3) Prolation: Prolatio was the division of a semibreve into minims.
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Source: 125