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apex

noun [C]
 
 
/ˈeɪ.peks/ (plural apexes, plural apices /ˈeɪ.pɪ.siːz/ )

Definition

specialized the highest point or top of a shape or object: the apex of a triangle/pyramidEdges and extremities of objectsSurfaces of objects figurative the highest point or most successful part of something: He reached the apex of his career during that period.Higher and lower points of achievementSuccess and achievementsFailures apical
 
 
/ˈeɪ.pɪ.kəl/ adjective
(Definition of apex noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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