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[ˈædvəsəri]

n. 敌手,对手

拆分: ad-朝,向 + -vers- + -ary名词词尾,人转向反面 

例:
He saw her as his main adversary within the company. 他将她视为公司中主要的对手。 
Great Britain and Germany were adversaryies in the Second World War. 英国与德国在第二次世界大战中曾互为敌国。