Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin

apex

 noun
     
a‧pex [countable]
1 technical the top or highest part of something pointed or curved:
the apex of the roof
the apex of a pyramid
2 formal the most important position in an organization or society:
The king was at the apex of society.
3 formal the most successful part of something:
He was at the apex of his career.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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