a body of persons entrusted with a mission to a sovereign or government, especially an ambassador and his or her staff.
2.
the official headquarters of an ambassador.
3.
the function or office of an ambassador.
4.
a mission headed by an ambassador.
Origin: 1570–80; variant of ambassy < Middle French ambassee,Old French ambasce, ambaxee ≪ Old Provençal ambaissada, derivative of embayssar to send a delegate < Medieval Latin ambasciāre, derivative of ambascia service, office, derivative, by a Gmc intermediary (compare Gothic andbahti,Old High German ambahti) of Gallo-Latin ambactus retainer, servant (< Gaulish, equivalent to amb- around, ambi- + -act- verbal adjective of *ag- drive, lead; compare act, Welsh amaeth husbandman); compare ambassador
1579, from M.Fr. embassee "mission, charge, office of ambassador," from It. ambasciata, from O.Prov. ambaisada "office of ambassador," from Gaul. *ambactos "dependant, vassal," lit. "one going around."