LATIN DICTIONARYLexicon Latīnum
prefix

di-

di-
Classical[dɪ]Ecclesiastical[di]

Meaning

  1. morphemeTwo, double; di-.

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

dī- see 3 dis-.

Origins

Borrowed from Ancient Greek δῐ- (dĭ-), from δίς (dís, “twice, doubly”).

Quick answers

What does di- mean in Latin?
di-, a prefix, means “Two, double; di-.”.
How do you pronounce di-?
In classical Latin, [dɪ]; in ecclesiastical (church) Latin, [di].