Definition of usurper noun from the Oxford Advanced Learner's Dictionary

 

usurper

 noun
noun
BrE BrE//juːˈzɜːpə(r)//
 
; NAmE NAmE//juːˈzɜːrpər//
 
(formal)
 
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a person who takes somebody's position and/or power without having the right to do this the usurper of the throne