apex

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun the highest point (of something)
noun the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars

Borrowed from Latin apex (“point, tip, summit”).

Its apex might be likened to a point. — White Fang, Jack London
He was near the apex of The Gore. — Flamsted quarries, Mary E. (Mary Ella) Waller
The stars are the apexes of what wonderful triangles! — Walden, and On The Duty Of Civil Disobedience, Henry David Thoreau

vertex, peak, acme

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