[ uh-lahyd, al-ahyd ]
/ əˈlaɪd, ˈæl aɪd /


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

Origin of allied

Middle English word dating back to 1250–1300; see origin at ally, -ed2

Related forms

non·al·lied, adjectivepre·al·lied, adjectiveun·al·lied, adjectivewell-al·lied, adjective

Definition for allied (2 of 2)


[ verb uh-lahy; noun al-ahy, uh-lahy ]
/ verb əˈlaɪ; noun ˈæl aɪ, əˈlaɪ /

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

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

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

to enter into an alliance; join; unite.

noun, plural al·lies.

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.
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.
a person who associates or cooperates with another; supporter.

Origin of ally

1250–1300; Middle English alien < Anglo-French al(l)ier, aillaier, Old French alier < Latin alligāre to bind to. See alloy

Related forms

al·li·a·ble, adjectivepre·al·ly, noun, plural pre·al·lies.pre·al·ly, verb, pre·al·lied, pre·al·ly·ing.

Can be confused

allay alley alloy ally (see synonym study at allay) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for allied

British Dictionary definitions for allied (1 of 3)


/ (əˈlaɪd, ˈælaɪd) /


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

British Dictionary definitions for allied (2 of 3)


/ (ˈælaɪd) /


of or relating to the Allies

British Dictionary definitions for allied (3 of 3)


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

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

noun (ˈælaɪ, əˈlaɪ) plural -lies

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

Word Origin for ally

C14: from Old French alier to join, from Latin alligāre to bind to, from ligāre to bind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012