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apex

[ey-peks]
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noun, plural a·pex·es, a·pi·ces [ey-puh-seez, ap-uh-] /ˈeɪ pəˌsiz, ˈæp ə-/.
  1. the tip, point, or vertex; summit.
  2. climax; peak; acme: His election to the presidency was the apex of his career.
  3. Astronomy. solar apex.
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Origin of apex

Borrowed into English from Latin around 1595–1605

APEX

[ey-peks]
  1. a type of international air fare offering reduced rates for extended stays that are booked in advance.
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Origin of APEX

1970–75; A(dvance) P(urchase) Ex(cursion)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for apex

apex

noun plural apexes or apices (ˈæpɪˌsiːz, ˈeɪ-)
  1. the highest point; vertex
  2. the pointed end or tip of something
  3. a pinnacle or high point, as of a career, etc
  4. Also called: solar apex astronomy 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
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Word Origin

C17: from Latin: point

APEX

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

Word Origin and History for apex

n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

apex in Medicine

apex

pĕks)
n. pl. a•pex•es
  1. The pointed end of a conical or pyramidal structure.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

apex in Science

apex

pĕks]
  1. The highest point, especially the vertex of a triangle, cone, or pyramid.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.