The story
- Proto-Indo-European*h₂ewg-
- Proto-Indo-European*h₂owg-éye-ti
- Proto-Italic*augejō
- Proto-Italic*augeō
- Latinaugeō
- Latinauctor
- Latinauctōritā
- Old Frenchautorité
- Middle Englishauctorite
- Englishauthority
- Englishauthoritarian
- English todayauthoritarianism
From authoritarian + -ism.
Etymology from Wiktionary, CC BY-SA 4.0.