midseason

The story

1. Proto-Indo-European*me
2. Proto-Indo-European*dʰeh₁-?
3. Proto-Indo-European*médʰi
4. Proto-Indo-European*médʰyos
5. Proto-Germanic*midjaz
6. Proto-West Germanic*midi
7. Old Englishmidd
8. Middle Englishmid
9. Englishmid
10. Englishmid-
11. Proto-Indo-European*h₂éd
12. Proto-Italic*ad
13. Proto-Italic*ad-
14. Latinad-
15. Old Frencha-
16. Frencha-
17. Proto-Indo-European*seh₁-redup.
18. Proto-Indo-European*sísh₁eti
19. Proto-Italic*sizō
20. Latinserō
21. Latinsatiō
22. Old Frenchsaison
23. Frenchsaison
24. Frenchassaisonner
25. Englishseason
26. English todaymidseason

From mid- + season.