Definition of tactus in English:

tactus

noun

Music
  • A principal accent or rhythmic unit, especially in 15th- and 16th- century music.

    ‘a tactus that hovers around 72-6’
    [mass noun] ‘a correspondence of tactus between chant and polyphony’
    • ‘The sections in sesquialtera can then be conducted by simply altering the even tactus of the opening duple meter to an uneven tactus, without changing the timing of the full tactus beat itself.’
    • ‘It is also clear that there is more danger of too slow and stodgy a tempo when the lesser tactus is used.’
    • ‘The strings, with great unanimity of tone, provide the delicate motor, the tactus, that allows the pianist to fly.’

Origin

Latin.

Pronunciation:

tactus

/ˈtaktəs/