ally

To ally is to join another in a mutually beneficial relationship. (verb)

An example of ally is a couple who gets married.

An ally is an individual, country or organization that unites with another. (noun)

An example of an ally is Britain to the US in World War II.

In the field of biology, ally refers to two things that have an evolutionary relationship. (noun)

An example of a vegetable that is an ally is cabbage as compared to brussel sprouts.

See ally in Webster's New World College Dictionary

transitive verb allied, allying

to unite or associate for a specific purpose, as families by marriage, nations by treaty, or companies by agreement: generally used reflexively or in the passive
to relate by similarity of structure, certain qualities, etc.: usually in the passive: the onion is allied to the lily

intransitive verb

to become allied

noun pl. allies

See ally in American Heritage Dictionary 4

(ə-līˈ, ălˈī)

verb al·lied, al·ly·ing, al·lies

verb, transitive

To place in a friendly association, as by treaty: Italy allied itself with Germany during World War II.
To unite or connect in a personal relationship, as in friendship or marriage.

verb, intransitive

To enter into an alliance: Several tribes allied to fend off the invaders.

noun pl. al·lies

One that is allied with another, especially by treaty: entered the war as an ally of France.
One in helpful association with another: legislators who are allies on most issues. See Synonyms at partner.
Allies
a. The nations allied against the Central Powers of Europe during World War I. They were Russia, France, Great Britain, and later many others, including the United States.
b. The nations, primarily Great Britain, France, the Soviet Union, and the United States, allied against the Axis during World War II.

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» ally synonyms

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