Adverb
divisi (not comparable)
(music) divided (within one instrumental part, simultaneous notes between two or more players)
Antonym: non divisi
Also, some composers write divided (divisi) parts for the basses, where upper and lower parts in the music are often assigned to "outside" (nearer the audience) and "inside" players. Source: Internet
The first evidence of polyphony with more than one singer per part comes in the Old Hall Manuscript (1420, though containing music from the late 14th century), in which there are apparent divisi, one part dividing into two simultaneously sounding notes. Source: Internet