Webster's English Dictionary

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alliance

al.li.ance \*-'li--*n(t)s\ n 1a: the state of being allied : the action of 
   allying  1b: a bond or connection between families, states, parties, or 
   individuals  2: an association to further the common interests of the 
   members; esp  : a confederation of nations by formal treaty 3: union by 
   relationship in qualities : AFFINITY