The story
- Latin · derived frommotus“motion”
- Medieval Latin · derived frommotu proprio
- English todaymotu proprio
From Medieval Latin motu proprio, from ablative form of classical Latin motus (“motion”) + proprius (“one’s own”).
Words from the same roots
Latinmotus all →
motilemero motumotific
Etymology from Wiktionary, CC BY-SA 4.0.