The story
- Proto-Indo-European*pós
- Proto-Indo-European*pósti
- Proto-Italic*posti
- Old Latinposte
- Latinpost
- Englishpost-
- Proto-Indo-European*h₂eǵ-
- Proto-Indo-European*h₂éǵeti
- Proto-Italic*agō
- Latinagō
- Ancient Greekἐνεργητικός (energētikós)
- Latināctīvu
- Old Frenchactif
- Middle Englishactyf
- Englishactive
- Englishactivate
- Englishactivation
- English todaypostactivation
From post- + activation.
Etymology from Wiktionary, CC BY-SA 4.0.