The story
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élyos
- Proto-Hellenic*ál͏̌l͏̌os
- Ancient Greekᾰ̓́λλος (ắllos)
- Englishallo-
- Proto-Indo-European*h₂eǵ-
- Proto-Indo-European*h₂éǵeti
- Proto-Italic*agō
- Latinagō
- Ancient Greekἐνεργητικός (energētikós)
- Latināctīvu
- Old Frenchactif
- Middle Englishactyf
- Englishactive
- Englishactivate
- Englishactivation
- English todayalloactivation
From allo- + activation.
Etymology from Wiktionary, CC BY-SA 4.0.