A minister of the highest rank sent to a foreign court to represent there his sovereign or country. (Sometimes called ambassador-in-residence) / An official messenger and representative.

plural of ambassador

A public figure who, as a volunteer, is an advocate for a good cause on behalf of a public organization.

Of or pertaining to an ambassador.

The post or office of ambassador.

plural of ambassadorship

In an ambassadorial way.

(rare) Without an ambassador.