mero motu

The story

1. Latin · derived frommōtus“motion, movement”
2. Latin · derived frommotu mero
3. English todaymero motu

From post-classical Latin motu mero (with transposition of elements), ablative of motus merus (“free impulse, volition”), from classical Latin mōtus (“motion, movement”).

Words from the same roots

First known use, by meaning

• from 17th c. (Of) one's own accord.