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English definition of “apex”

apex

noun [C] (SUCCESS)    /ˈeɪ.peks/ (plural apexes or apices   /ˈeɪ.pɪ.siːz/   )
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 (SUCCESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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