The story
- Proto-Indo-European*h₂el-
- Proto-Italic*olnos
- Old Latinolle
- Latinille
- English todayilleism
From Latin ille (“that man; he”) + -ism, modelled on egoism.
Words from the same roots
Latinille all →
illeistilleity
Etymology from Wiktionary, CC BY-SA 4.0.