Where does “infra-” come from?

infra- (French) comes from Latin infra, from Latin īnferā, from French inférer, from Latin īnferō, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en — in.

infra- (French): infra

Definitions

infra

Ancestry of “infra-”, step by step

Step	Language	Word	Meaning
1	Latin	infra	below
2	Latin	īnferā	—
3	French	inférer	to infer
4	Latin	īnferō	to carry, bring, put, place, or throw in, into, to, or upon somewhere or something; insert
5	Latin	īn-	un-, non-, not
6	Latin	în	in, at, on, upon, from (space)
7	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
8	Proto-Italic	en	in
9	Proto-Indo-European	h₁én	in

Words derived from “infra-”

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Proto-Italic en →