Late Middle English; earliest use found in Edward, Duke of York (fl. c1373–1415), magnate. From Middle French, French mon ami from mon my + ami friend.
Definition of mon ami in US English:
mon ami
(also mon amie)
nounˌmɒn aˈmiː
My friend (chiefly as a form of address).
Origin
Late Middle English; earliest use found in Edward, Duke of York (fl. c1373–1415), magnate. From Middle French, French mon ami from mon my + ami friend.