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English definition of “apex”

apex

noun [C] (HIGHEST POINT)    /ˈeɪ.peks/ (plural apexes or apices   /ˈeɪ.pɪ.siːz/   )
specialized mathematics the highest point or top of a shape or object: the apex of a triangle/pyramidEdges and extremities of objectsSurfaces of objects apical     /ˈeɪ.pɪ.kəl/ adjective
(Definition of apex noun (HIGHEST POINT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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