Where does “external” come from?

External comes from Middle French externe, meaning outside or outer.

external (English): Outside of something; on the exterior; Not...

Definitions

Step	Language	Word	Meaning
1	Latin	externus	outward, external; foreign, alien, strange
2	Latin	exter	On the outside, outward, external, outer; Of...
3	Proto-Italic	*eksteros	—

external — Etymology, Origin & Word History | Etymology Explorer