Definition of pivotal adjective from the Oxford Advanced Learner's Dictionary

 

pivotal

 adjective
adjective
BrE BrE//ˈpɪvətl//
 
; NAmE NAmE//ˈpɪvətl//
 
 
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of great importance because other things depend on it a pivotal role in European affairs Accountancy, law and economics are pivotal to a successful career in any financial services area.
See the Oxford Advanced American Dictionary entry: pivotal