the act or state of occluding or the state of being occluded.
Dentistry. the fitting together of the teeth of the lower jaw with the corresponding teeth of the upper jaw when the jaws are closed.
Pathology. closure or blockage of a blood vessel: coronary occlusion.
Phonetics. momentary complete closure at some area in the vocal tract, causing stoppage of the flow of air and accumulation of pressure.
the formation of an occluded front.

1635–45; < Latin occlūs(us) (past participle of occlūdere to occlude) + -ion

occlusal [uh-kloo-suhl, -zuhl] , adjective
nonocclusion, noun
preocclusion, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
occlusion (əˈkluːʒən)
1.  the act or process of occluding or the state of being occluded
2.  meteorol another term for occluded front
3.  dentistry the normal position of the teeth when the jaws are closed
4.  phonetics the complete closure of the vocal tract at some point, as in the closure prior to the articulation of a plosive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1640s, from L. *occlusionem, noun of action from occludere (see occlude). Dentistry sense is from 1880.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

occlusion oc·clu·sion (ə-klōō'zhən)

  1. The act of occluding or the state of being occluded.

  2. An obstruction or a closure of a body passage.

  3. Any contact between the cutting or chewing surfaces of opposing teeth.

  4. The alignment of the teeth of the upper and lower jaws when brought together.

  5. The absorption of a gas or other substance, as by a metal.

  6. The inclusion of one substance within another.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
occlusion   (ə-kl'zhən)  Pronunciation Key 
  1. An obstruction in a passageway, especially of the body.

  2. The alignment of the upper and lower sets of teeth with each other.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Retinal artery occlusion is a blockage in one of the small arteries that carry
  blood to the retina.
It also allows for the correct image occlusion as well as the appropriate image
  shading necessary for each item.
Tubal occlusion is one of several techniques on the horizon at a time when
  sterilization is becoming increasingly common.
For example, blood clots can cause mesenteric artery occlusion.
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