Ally
Webster's Dictionary [1]
(1): (v.) Anything associated with another as a helper; an auxiliary.
(2): (v.) Anything akin to another by structure, etc.
(3): (v.) A relative; a kinsman.
(4): (v. t.) To unite, or form a connection between, as between families by marriage, or between princes and states by treaty, league, or confederacy; - often followed by to or with.
(5): (v.) One united to another by treaty or league; - usually applied to sovereigns or states; a confederate.
(6): (v. t.) To connect or form a relation between by similitude, resemblance, friendship, or love.
(7): (n.) See Alley, a marble or taw.
King James Dictionary [2]
1. To unite, or form a relation, as between families by marriage, or between princes and states by treaty, league or confederacy. 2. To form a relation by similitude, resemblance or friendship. Note. This word is more generally used in the passive form, as families are allied by blood or reciprocally, as princes ally themselves to powerful states.