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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
1595-1605; < Latin


[ey-peks] /ˈeɪ pɛks/
a type of international air fare offering reduced rates for extended stays that are booked in advance.
1970-75; A(dvance) P(urchase) Ex(cursion) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for apex
Contemporary Examples
Historical Examples
  • We have then a somewhat pear-shaped area or triangular area with the apex at the apex of the heart.

    Arteriosclerosis and Hypertension: Louis Marshall Warfield
  • Researches in the direction of the apex have not been made recently.

  • Longitudinally and horizontally, from apex to apex of the cones, was a steel deck dividing the vessel into two equal parts.

    A. D. 2000 Alvarado M. Fuller
  • With the pointer in his hand he touched the star at the apex of the fir.

    Bride of the Mistletoe James Lane Allen
  • Spiro was delaying their death until the workers of apex would have time to gather and witness it.

    The Heads of Apex Francis Flagg
British Dictionary definitions for apex


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


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
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 apex

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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apex 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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apex 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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Related Abbreviations for apex


Arctic Polynya Experiment
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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