(transitive) To unite or form a connection between (people or things), as between families by marriage, or between states by confederacy, league, or treaty.
(transitive) Chiefly followed by to or with: to connect or form a relation to (someone or something) by similarity in features or nature.
(reflexive, transitive) To join or unite (oneself or itself) against, with, etc., someone or something else.
(intransitive) Chiefly followed by with: to enter into an alliance or unite for a common aim.

A person who co-operates with or helps another; an associate; a friend.
A person who co-operates with or helps another; an associate; a friend.
A person, group, state, etc., which is associated or united by treaty with another for a common (especially military or political) purpose; a confederate.
Something regarded as connected with or related to another thing by similarity in features or nature.
Something regarded as connected with or related to another thing by similarity in features or nature.
(figuratively) A person, group, concept, etc., which is associated with another as a helper; an auxiliary; a supporter.
(historical, obsolete) A kinsman or kinswoman; a relative.

(obsolete, plural, plural-only) One's relatives; kin, kindred, relations; also, relationship through descent or marriage; kinship.
(obsolete, plural, plural-only) People, groups, states, etc., which are associated or united with each other for a common purpose; confederates; also, the state of being allied; alliance, confederation.

Alternative spelling of alley (“a glass marble or taw”).

allying

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