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
- Englishenvironment
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishenvironmental
- English todayenvironmentalism
From environmental + -ism.
Etymology from Wiktionary, CC BY-SA 4.0.