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apex

[ey-peks]

Origin

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noun, plural a·pex·es, a·pi·ces

[ey-puh-seez, ap-uh-] .

the tip, point, or vertex; summit.

climax; peak; acme: His election to the presidency was the apex of his career.

Astronomy. solar apex.

Origin:
1595–1605; < Latin

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Apex is always a great word to know.

So is pulsar. Does it mean:

one of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation such as radio waves with a high degree of regularity

a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics

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Dictionary.com Unabridged

a type of international air fare offering reduced rates for extended stays that are booked in advance.

Origin:
1970–75; A(dvance) P(urchase) Ex(cursion)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To APEX

Collins

World English Dictionary

apex (ˈeɪpɛks)

—n , pl apexes, apices
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.	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

[C17: from Latin: point]

APEX (ˈeɪpɛks)

—*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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

apex

c.1600, from L. apex "summit, peak, tip;" probably related to apere "to fasten, fix," hence "the tip of anything" (one of the meanings in L. was "small rod at the top of the flamen's cap"). Proper plural is apices.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

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.