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English definition of “apex”

apex

noun [C] uk   /ˈeɪ.peks/ (plural apexes or apices   /ˈeɪ.pɪ.siːz/   ) us  

apex noun [C] (HIGHEST POINT)

specialized mathematics the highest point or top of a shape or object: the apex of a triangle/pyramid

apex noun [C] (SUCCESS)

figurative the highest point or most successful part of something: He reached the apex of his career during that period.

apex noun [C] (BODY ORGAN)

specialized medical a medical word for the pointed end of an organ: A chest x-ray showed an abnormality in the left lung apex.
apical
adjective uk   /ˈeɪ.pɪ.kəl/ us  
(Definition of apex noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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