(1):

(n.) A legate, or envoy, and the persons associated with him in his mission; an embassy; or, in stricter usage, a diplomatic minister and his suite; a deputation.

(2):

(n.) A district under the jurisdiction of a legate.

(3):

(n.) The sending forth or commissioning one person to act for another.

(4):

(n.) The place of business or official residence of a diplomatic minister at a foreign court or seat of government.