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Published online by Cambridge University Press: 20 November 2018
(1) Tempus perfectum means triple time; the qualification cum prolatione majori means that each of the three beats is subdivided three times, usually transscribed as 9/8.
(2) Tempus imperfectum means duple time; the qualification cum prolatione majori means that each of the two beats is subdivided three times, usually transcribed as 6/8.
(3) An obvious notational device for expressing division into two-plus-two-plus-two beats in a general motion pattern of three-plus-three beats.