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

 

ouster

 noun
noun
BrE BrE//ˈaʊstə(r)//
 
; NAmE NAmE//ˈaʊstər//
 
(North American English)
 
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the act of removing somebody from a position of authority in order to put somebody else in their place; the fact of being removed in this way the president’s ouster by the military
See the Oxford Advanced American Dictionary entry: ouster