mechanoactivity

The story

1. Proto-Indo-European*megʰ-der.?
2. Ancient Greekμηχανή (mēkhanḗ)
3. Ancient Greekμηχανικός (mēkhanikós)
4. Latinmēchanicus
5. Old Frenchmecanique
6. Middle Englishmekanyk
7. Englishmechan(ic)
8. Englishmechano-
9. Proto-Indo-European*h₂eǵ-
10. Proto-Indo-European*h₂éǵeti
11. Proto-Italic*agō
12. Latinagō
13. Ancient Greekἐνεργητικός (energētikós)
14. Latināctīvus
15. Latināctīvitās
16. Middle Frenchactivité
17. Englishactivity
18. English todaymechanoactivity

From mechano- + activity.