Etymology
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allied (adj.)

c. 1300, past-participle adjective from ally (v.). Originally of kindred (compare alliance); in reference to a league or formal treaty, it is first recorded late 14c.

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Definitions of allied
1
allied (adj.)
related by common characteristics or ancestry;
allied studies
allied species
allied (adj.)
united in a confederacy or league;
Synonyms: confederate / confederative
allied (adj.)
joined by treaty or agreement;
2
Allied (adj.)
of or relating to or denoting the Allies in World War II;
Allied (adj.)
of or relating to or denoting the Allies in World War I;
an allied offensive
From wordnet.princeton.edu