(1):

(n.) See Federalist.

(2):

(a.) Composed of states or districts which retain only a subordinate and limited sovereignty, as the Union of the United States, or the Sonderbund of Switzerland.

(3):

(a.) Pertaining to a league or treaty; derived from an agreement or covenant between parties, especially between nations; constituted by a compact between parties, usually governments or their representatives.

(4):

(a.) Friendly or devoted to such a government; as, the Federal party. see Federalist.

(5):

(a.) Consisting or pertaining to such a government; as, the Federal Constitution; a Federal officer.