Where does “intensif” come from?

intensif (Middle French) comes from Medieval Latin intensivus, from Latin intendere, from Latin intendo, from Latin in-, from Latin in, from Old Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

Ancestry of “intensif”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	intensivus	intensive
2	Latin	intendere	third-person plural perfect active indicative of...
3	Latin	intendo	I stretch out; I strain; I turn my attention to,...
4	Latin	in-	un-, non-, not; in, within, inside
5	Latin	in	in, at, on, upon, from; within, while in; into,...
6	Old Latin	en	in
7	Proto-Italic	en	in
8	Proto-Indo-European	h₁én	in

Words derived from “intensif”

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