9 Grammatical Pitfalls


[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
  • In spatial terms, it stood at the apex of a vertical axis.
  • When the pocket widens during the power phase, the gases spread almost to the next apex with incredible speed.
  • It will stand at the apex of a system of national central banks.
  • Adult alligators are apex predators critical to the biodiversity of their habitat.
  • And as anyone who follows the company knows, this is the time of year when rumors tend to reach their apex.
  • What often goes unremarked upon is the relationship between apex predators, prey species, and second-tier predators.
  • At the apex is the prime minister.
  • The incisors of the sheep are roughly wedge-shaped, with the apex at the root end.
  • Socialists think it's the apex of morality.
  • Sharks are scavengers and apex predators.
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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