ally

noun

A person, group, or state (etc) which is associated with another for a common cause; one united to another by treaty or common purpose; a confederate.
"the two countries were allies in WWI"
A person, group, concept (etc) which is associated with another as a helper; a supporter; an auxiliary.
Anything akin to something else by structure, etc.

verb

To unite, or form a connection between, as between families by marriage, or between princes and states by treaty, league, or confederacy.
To connect or form a relation between by similitude, resemblance, friendship, or love.

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