1. joined by treaty, agreement, or common cause: allied nations.
  2. related; kindred: allied species.
  3. (initial capital letter) of or relating to the Allies.

verb (used with object), al·lied, al·ly·ing.

  1. to unite formally, as by treaty, league, marriage, or the like (usually followed by with or to): Russia allied itself to France.
  2. to associate or connect by some mutual relationship, as resemblance or friendship.

verb (used without object), al·lied, al·ly·ing.

  1. to enter into an alliance; join; unite.

noun, plural al·lies.

  1. a person, group, or nation that is associated with another or others for some common cause or purpose: Canada and the United States were allies in World War II.
  2. Biology. a plant, animal, or other organism bearing an evolutionary relationship to another, often as a member of the same family: The squash is an ally of the watermelon.
  3. a person who associates or cooperates with another; supporter.


  1. joined, as by treaty, agreement, or marriage; united
  2. of the same type or class; related


  1. of or relating to the Allies

verb (əˈlaɪ) -lies, -lying or -lied (usually foll by to or with)

  1. to unite or be united, esp formally, as by treaty, confederation, or marriage
  2. (tr; usually passive) to connect or be related, as through being similar or compatible

noun (ˈælaɪ, əˈlaɪ) plural -lies

  1. a country, person, or group allied with another
  2. a plant, animal, substance, etc, closely related to another in characteristics or form

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


late 14c., “relative, kinsman,” from ally (v.); mid-15c. in the sense of “one united with another by treaty or league.”


late 13c., “to join in marriage,” from Old French alier “combine, unite,” from a differentiated stem of aliier (from Latin alligare “bind to;” see alloy). Meaning “to form an alliance, join, associate” is late 14c. Related: allied; allying.

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