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The following is from Harvard Dict of Music 2nd Edit. (from the definition of 'Discant')

I've never heard these two terms: mensural and modal rhythm. Google gave nothing, neither did Britannica.

What do these two terms mean?

The Text: '(...) The ideal of contrary motion was mentioned in the 13th-century Tractatus de Discantu (in J.-A.-L. de la Fage, Essais, i, 358; CS i, 311) but became an essential characteristic of discant theory only at the end of the 13th century, when modal rhytm was replaced by mensural rhytm.'

The following is from Harvard Dictionary of Music 2nd Edit.

From the definition of 'Discant' (bold added):

[...] The ideal of contrary motion was mentioned in the 13th-century "Tractatus de Discantu" (in J.-A.-L. de la Fage, Essais, i, 358; CS i, 311) but became an essential characteristic of discant theory only at the end of the 13th century, when modal rhythm was replaced by mensural rhythm.

Full page of context:

I've never heard these two terms: mensural and modal rhythm. Google gave nothing, neither did Britannica.

What do these two terms mean?

The following is from Harvard Dict of Music 2nd Edit. (from the definition of 'Discant')

I've never heard these two terms: mensural and modal rhythm. Google gave nothing, neither did Britannica.

What do these two terms mean?

The following is from Harvard Dict of Music 2nd Edit. (from the definition of 'Discant')

I've never heard these two terms: mensural and modal rhythm. Google gave nothing, neither did Britannica.

What do these two terms mean?

The Text: '(...) The ideal of contrary motion was mentioned in the 13th-century Tractatus de Discantu (in J.-A.-L. de la Fage, Essais, i, 358; CS i, 311) but became an essential characteristic of discant theory only at the end of the 13th century, when modal rhytm was replaced by mensural rhytm.'