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“octave” in Latin

The English word octave itself goes back to Latin octāvus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

octave
In music, diapason; intervallurn septem vocum (an interval between the notes of the same name): octo voces or soni (a series of eight notes).

Quick answer

What is the Latin word for octave?
The usual Latin words for “octave” are dĭăpāsōn, sonus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.