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

 

apex

 noun
noun
BrE BrE//ˈeɪpeks//
 
; NAmE NAmE//ˈeɪpeks//
 
[usually singular](pl. apexes)
 
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the top or highest part of something the apex of the roof/triangle (figurative) At 37, she'd reached the apex of her career. Word Origin early 17th cent.: from Latin, ‘peak, tip’.

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