from The American HeritageĀ® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The highest point of something.
  • n. The moment of greatest success, expansion, etc.
  • n. The topmost vertex of a cone or pyramid (in their conventional orientation).
  • n. The pointed end of something.
  • n. The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.
  • n. The point on the celestial sphere toward which the sun appears to move relative to nearby stars.
  • n. The lowest point on a pendant drop of a liquid.
  • n. The end or edge of a vein nearest the surface.

from the GNU version of the Collaborative International Dictionary of English

  • n. The tip, top, point, or angular summit of anything
  • n. The end or edge of a vein nearest the surface.

from The Century Dictionary and Cyclopedia

  • n. The tip, point, or summit of anything.
  • n. In geology, the top of an anticlinal fold of strata. [Pennsylvania coal-mines.] [This term as used in the U. S. Revised Statutes has been the occasion of much litigation. It is supposed to mean something nearly equivalent to outcrop (which see); but precisely in what it differs from outcrop has not been, neither does it seem capable of being, distinctly made out.]
  • n. In mining, the landing-point at the top of a slope.
  • n. In Roman antiquity, a symbolic ornament which the flamens and some other priests were required by law to wear.
  • n. In projective geometry, the point determined by 3 planes.
  • n. plural The abacusmarks.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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


(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin apexĀ ("point, tip, summit"). (Wiktionary)


  • The breaking point, so to speak, of man's vision, that ecstasy of comprehension which I call his apex-thought, is the moment which makes him aware of these companions 'existence.

    The Complex Vision

  • However, if you a forty first experiment, and it tells you that the apex is somewhere wildly different in the picture, it would have told you that either you made some mistake, or that your assumption, that the standard model is the only source of CP violation, was incorrect.

    A Non-Technical Explanation of Flavo(u)r Physics « Imaginary Potential

  • But his early work could be viewed as lacking in seriousness, and thus my choice for his apex is Americana, the 2001 volume that would be the last verse collection to appear under his name during his lifetime, anyway; I suspect we may see a posthumous collection.

    Archive 2009-02-01

  • My thought process begins where the regular human apex is at.

    July 2004

  • PGA Tour may have reached a short-term apex financially given the weakened economy, sports sponsorships generally being harder to come by, and a slow erosion of fan interest in the sport which is partly related to Tiger's lost dominance. News

  • Ten years ago, while studying some roots, almost incidentally he discovered that a small part of the root called the apex is better protected and consumes more oxygen than the rest of the plant.

    Plants Will Think For Us

  • MOSS: What I make is that this is a very disturbed family and that the apex is a very disturbed girl.

    CNN Transcript Feb 18, 2009

  • The apex is the King or Queen, depending on the nation with its base the national family.

    Archive 2008-09-14

  • JOHN ZARRELLA, CNN CORRESPONDENT: They are what is called apex predators, the top of the food chain.

    CNN Transcript Mar 25, 2008

  • JOHN ZARRELLA, CNN CORRESPONDENT: They are what's called apex predators, the top of the food chain.

    CNN Transcript Mar 27, 2008


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  • the tip, point, or vertex; summit.

    May 26, 2009