The story
- Proto-Indo-European*h₂éd
- Proto-Italic*ad
- Proto-Italic*ad-
- Latinad-
- Old Frencha-
- Medieval Latinmusumder.?
- Old Frenchmuser
- Old Frenchamuser
- Middle Frenchamuser
- Middle Frenchamusement
- English todayamusement
Borrowed from Middle French amusement, from amuser + -ment. Morphologically amuse + -ment.
Etymology from Wiktionary, CC BY-SA 4.0.