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[ey-peks] /ˈeɪ pɛks/
noun, plural apexes, apices
[ey-puh-seez, ap-uh-] /ˈeɪ pəˌsiz, ˈæp ə-/ (Show IPA)
the tip, point, or vertex; summit.
climax; peak; acme:
His election to the presidency was the apex of his career.
Astronomy. solar apex.
Origin of apex
Borrowed into English from Latin around 1595-1605 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for apexes
Historical Examples
  • The leading design is naturally the Herati, and again one sees the palm leaf with its apexes all pointing in the same direction.

  • Their apexes will probably come at about K and M in Fig. 208.

    Toy-Making in School and Home

    Ruby Kathleen Polkinghorne and Mabel Irene Rutherford Polkinghorne
  • It has two cone-shaped superimposed glass globes connected at their apexes through a small opening.

    Time Telling through the Ages Harry Chase Brearley
  • It was the duplicating lines of the departing sun, upon the castellated rocks, as they pierced between the apexes and the basin.

    Mal Moule Ella Wheeler Wilcox
  • The centre gable overlaps the portal beneath, and the apexes of the two side gables are beyond the middle of the two side portals.

    Cathedral Cities of Italy William Wiehe Collins
  • The Household Cavalry were given helmets with weeping plumes fixed to the apexes.

    Chats on Military Curios Stanley C. Johnson
British Dictionary definitions for apexes


noun acronym
Advance Purchase Excursion: a reduced airline or long-distance rail fare that must be paid a specified number of days in advance
(in Britain) Association of Professional, Executive, Clerical, and Computer Staff


noun (pl) apexes, apices (ˈæpɪˌsiːz; ˈeɪ-)
the highest point; vertex
the pointed end or tip of something
a pinnacle or high point, as of a career, etc
(astronomy) Also called solar apex. the point on the celestial sphere, lying in the constellation Hercules, towards which the sun appears to move at a velocity of 20 kilometres per second relative to the nearest stars
Word Origin
C17: from Latin: point
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for apexes



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- "to take, reach." Proper plural is apices.

Online Etymology Dictionary, © 2010 Douglas Harper
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apexes in Medicine

apex a·pex (ā'pěks)
n. pl. a·pex·es or a·pi·ces (ā'pĭ-sēz', āp'ĭ-)
The pointed end of a conical or pyramidal structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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apexes in Science
The highest point, especially the vertex of a triangle, cone, or pyramid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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