microactivity

The story

1. Proto-Indo-European*mey-der.?
2. Ancient Greekμῑκρός (mīkrós)
3. Ancient Greekμῑκρο- (mīkro-)
4. Englishmicro-
5. Proto-Indo-European*h₂eǵ-
6. Proto-Indo-European*h₂éǵeti
7. Proto-Italic*agō
8. Latinagō
9. Ancient Greekἐνεργητικός (energētikós)
10. Latināctīvus
11. Latināctīvitās
12. Middle Frenchactivité
13. Englishactivity
14. English todaymicroactivity

From micro- + activity.