Where does “binaire” come from?

binaire (French) comes from Latin bīnārius, from Latin -ārius, from Proto-Italic *-āzios.

binaire (French): binary; binary file

Definitions

Step	Language	Word	Meaning
1	Latin	bīnārius	—
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—

binaire — Etymology, Origin & Word History | Etymology Explorer