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apex

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The definition of apex is the highest part of something.

(noun)

The peak of a mountain is an example of its apex.

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See apex in Webster's New World College Dictionary

noun pl. apexes or apices

the highest point; peak; vertex
the pointed end; tip
the highest point of interest, excitement, etc.; climax
☆ Mining the edge or outcrop of a vein nearest the surface

Origin: L, a point; prob. < apere, to fasten: see apt

See apex in American Heritage Dictionary 4

noun pl. a·pex·es or a·pi·ces (āˈpĭ-sēzˌ, ăpˈĭ-)

The highest point; the vertex: the apex of a triangle; the apex of a hill.
The point of culmination. See Synonyms at summit.
The usually pointed end of an object; the tip: the apex of a leaf.

Origin:

Origin: Latin

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