LATIN DICTIONARYLexicon Latīnum
prefix

bi-

bi-
Classical[ˈbɪ]Ecclesiastical[ˈbiː]

Meaning

  1. morphemehaving two parts
  2. morphemeoccurring twice

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

bi- praep insep.
DVA-, twice, double.

Origins

From Proto-Italic *dwi-, from Proto-Indo-European *dwi- (“two-; twice-”), prefix form corresponding to the numeral *dwóh₁ (“two”); the origin in PIE of the *i here is uncertain.

Quick answers

What does bi- mean in Latin?
bi-, a prefix, means “having two parts; occurring twice”.
How do you pronounce bi-?
In classical Latin, [ˈbɪ]; in ecclesiastical (church) Latin, [ˈbiː].