Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “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)
Focus on the pronunciation of apex

Definitions of “apex” in other dictionaries

Word of the Day


the skill with which something was made or done

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More