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Definition of apex noun from the Oxford Advanced American Dictionary

     

    apex

     noun
    noun
    NAmE//ˈeɪpɛks//
     
    (pl. apexes) [usually singular]
     
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  1. 1the top or highest part of something the apex of the roof/triangle
  2. 2(figurative) At 37, she'd reached the apex of her career.