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

 

ascendancy

 noun
(also ascendency)noun
BrE BrE//əˈsendənsi//
 
; NAmE NAmE//əˈsendənsi//
 
 
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[uncountable] ascendancy (over somebody/something) (formal) the position of having power or influence over somebody/something moral/political/intellectual ascendancy The opposition party was in the ascendancy (= gaining control).
See the Oxford Advanced American Dictionary entry: ascendancy