al·ly

[v. uh-lahy; n. al-ahy, uh-lahy] verb, al·lied, al·ly·ing, noun, plural al·lies.
verb (used with object)
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)
3.
to enter into an alliance; join; unite.
noun
4.
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.
5.
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.
6.
a person who associates or cooperates with another; supporter.

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

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

allay, alley, alloy, ally (see synonym study at allay).


1. unify, join, combine, wed. 4. partner, confederate. 6. friend, aide, accomplice, accessory, assistant, abettor; colleague, coadjutor, auxiliary, helper.


4, 6. enemy, foe, adversary.
00:10
Ally is always a great word to know.
So is cell fusion. Does it mean:
the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that have the same body plan
the merging of two or more cells into a single cell
Dictionary.com Unabridged

-ally

an adverbial suffix attached to certain adjectives with stems in -ic that have no forms ending in -ical: terrifically.

Origin:
-al1 + -ly

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
ally
 
vb (usually foll by to or with) , -lies, -lying, -lied
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
 
n , -lies, -lying, -lied, -lies
3.  a country, person, or group allied with another
4.  a plant, animal, substance, etc, closely related to another in characteristics or form
 
[C14: from Old French alier to join, from Latin alligāre to bind to, from ligāre to bind]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

ally
c.1300, from O.Fr. alier "combine, unite," from a differentiated stem of aleier (source of alloy), from L. alligare "bind to" (see alloy). The noun is c.1600 in the sense of "one united with another by treaty or league," from the verb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Superman was created to be the ally of the average American, the guy who didn't
  have lots of money or friends in high places.
But the inertia of ice sheets is not our ally against the effects of global
  warming.
Ralls and her colleagues have a new ally in their research: a dog.
And in that sense, location is indeed a powerful ally.
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