apex Meaning, Definition & Usage

  1. noun the highest point (of something)
    vertex; peak; acme.
    • at the peak of the pyramid
  2. noun the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
    solar apex; apex of the sun's way.

WordNet

A"pex noun
Etymology
L.
Wordforms
plural E Apexes L Apices
Definitions
  1. The tip, top, point, or angular summit of anything; as, the apex of a mountain, spire, or cone; the apex, or tip, of a leaf.
  2. (Mining) The end or edge of a vein nearest the surface. U.S.

Webster 1913