LATIN DICTIONARYLexicon Latīnum
adverb

octāvum

octāvum (not comparable)
Classical[ɔkˈtaː.wũː]Ecclesiastical[okˈtaː.vum]

Meaning

  1. not comparablefor the eighth time

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

octāvum adv.
octavus, for the eighth time: tribuni refecti, L.

Origins

Adverbial accusative of octāvus.

Quick answers

What does octāvum mean in Latin?
octāvum, a adverb, means “for the eighth time”.
How do you pronounce octāvum?
In classical Latin, [ɔkˈtaː.wũː]; in ecclesiastical (church) Latin, [okˈtaː.vum].