envoy: [14] English has acquired envoy – literally ‘sent on one’s way’ – twice. The first time, it meant ‘final part of a poem’ (this is now usually spelled envoi); the second time (in the 17th century) it meant ‘diplomatic representative’. Both came from the past participle of the French verb envoyer ‘send’, which in turn was a descendant of late Latin inviāre ‘put on the way’, a compound based on the noun via ‘way’. Its plural formed the basis of invoice [16]. => invoice[envoy etymology, envoy origin, 英语词源]