apex
a-pex
noun
The vertex of a geometric shape or tip of an organ.
"Locate the apex of the cone in the diagram."
noun
The most successful, powerful, or intense point of something.
"That decade represented the apex of her artistic creativity."
noun
The highest point or tip of a physical object.
"The eagle soared above the apex of the cliff."
Thesaurus
Synonyms: apex of the sun's way, solar apex, vertex, acme, peak
Antonyms: antapex