1a. A close association of nations or other groups, formed to advance common interests or causes: an alliance of labor unions opposing the bill.b. A formal agreement establishing such an association, especially an international treaty of friendship. 2. A connection based on kinship, marriage, or common interest; a bond or tie: the shifting alliances within a large family.3. Close similarity in nature or type; affinity: the ancient alliance between mathematics and music.4. The act of becoming allied or the condition of being allied: the church, acting in alliance with community groups.
ETYMOLOGY:
Middle English, from Old French aliance, from alier, to ally. See ally.
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