ex·clu·sion

[ik-skloo-zhuhn]
noun
1.
an act or instance of excluding.
2.
the state of being excluded.
3.
Physiology. a keeping apart; blocking of an entrance.

Origin:
1375–1425; late Middle English < Latin exclūsiōn- (stem of exclūsiō), equivalent to exclūs(us) (past participle of exclūdere to shut out; see exclude) + -iōn- -ion

ex·clu·sion·ar·y, adjective
non·ex·clu·sion, noun
pre·ex·clu·sion, noun
self-ex·clu·sion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Exclusion is always a great word to know.
So is arterial. Does it mean:
pertaining to the blood in the pulmonary vein, having been oxygenated during its passage through the lungs and being normally bright red
a bitter, alkaline, yellow or greenish liquid, secreted by the liver, that aids in absorption and digestion
Collins
World English Dictionary
exclusion (ɪkˈskluːʒən) [Click for IPA pronunciation guide]
 
n
the act or an instance of excluding or the state of being excluded
 
ex'clusionary
 
adj

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

exclusion
1610s, from L. exclusionem, noun of action from excludere (see exclude). Related: Exclusionary (1817).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exclusion ex·clu·sion (ĭk-skl&oomacr;'zhən)
n.
Surgical isolation of a part or segment without removal from the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Silicone the fur and capillary exclusion will have it dry in a quick wiggle,
  for both reasons: eg sheep and lanolin.
But it also guarantees parochialism and is grounded in exclusion.
She focuses on its role in reducing pain to the exclusion of its potential to
  harm the birth process.
Alzheimer's is still mainly a diagnosis of exclusion.
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