The story
- Proto-Indo-European*h₁én
- Proto-Italic*en
- Old Latinen
- Latinin
- Old Frenchen
- Latinvibrāre?
- Vulgar Latin*virāre
- Old Frenchvirer
- Old Frenchviron
- Old Frenchenviron
- Middle Frenchenviron
- Middle Frenchenvironner
- Middle Frenchenvironnement
- English todayenvironment
From Middle French environnement. Compare French environnement. By surface analysis, environ + -ment.
Etymology from Wiktionary, CC BY-SA 4.0.