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apex (n.)

"the tip, point, or summit" of anything, c. 1600, from Latin apex "summit, peak, tip, top, extreme end;" probably related to apere "to fasten, fix," hence "the tip of anything" (one of the meanings in Latin was "small rod at the top of the flamen's cap"), from PIE *ap- (1) "to take, reach" (see apt). Proper plural is apices.

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Definitions of apex from WordNet

apex (n.)
the highest point (of something);
Synonyms: vertex / peak / acme
apex (n.)
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars;
Synonyms: solar apex / apex of the sun's way
From wordnet.princeton.edu