Where does “inter-agency” come from?

inter-agency (English) comes from English inter, from Middle English enteren, from French entrer, from Middle French entrer, from Old French entrer, from Latin intrō, from Latin intra, from Latin interus — Contrastive or oppositional adjectival suffix.

Ancestry of “inter-agency”, step by step

inter-agency traces back through two separate lines of ancestry.

via English inter

StepLanguageWordMeaning
1EnglishinterTo bury in a grave; To confine, as in a prison
2Middle Englishenteren
3Frenchentrerto enter
4Middle Frenchentrerto enter
5Old Frenchentrerto enter
6Latinintrōto enter, go into, come in, get in, penetrate
7Latinintrawithin; inside; during; less than
8Latininterus
9Proto-Indo-Europeanh₁énterosinside, within
10Proto-Indo-European-terosContrastive or oppositional adjectival suffix

via English agency

StepLanguageWordMeaning
1EnglishagencyThe capacity, condition, or state of acting or of...
2Medieval Latinagentianominative neuter plural of agēns; accusative...
3Latinagēnsdoing, acting, making
4Latinagōto act, to behave
5Proto-Italicagōdrive; push, impel; do, act
6Proto-Indo-Europeanh₂éǵetito be driving
7Proto-Indo-Europeanh₂eǵ-to drive
Every word from Proto-Indo-European -teros
inter-agency — Etymology, Origin & Word History | Etymology Explorer