Where does “intrusion” come from?

intrusion (Old French) comes from Latin intrusio, from Latin intrudo, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

Ancestry of “intrusion”, step by step

StepLanguageWordMeaning
1Latinintrusio—
2Latinintrudoto thrust in, force in
3Latinīn-un-, non-, not
4Latinînin, at, on, upon, from (space)
5Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
6Proto-Italicenin
7Proto-Indo-Europeanh₁énin

Words derived from “intrusion”

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