[uh-kloo-zhuh n]
  1. the act or state of occluding or the state of being occluded.
  2. Dentistry. the fitting together of the teeth of the lower jaw with the corresponding teeth of the upper jaw when the jaws are closed.
  3. Pathology. closure or blockage of a blood vessel: coronary occlusion.
  4. Phonetics. momentary complete closure at some area in the vocal tract, causing stoppage of the flow of air and accumulation of pressure.
  5. Meteorology.
    1. the formation of an occluded front.
    2. occluded front.

Origin of occlusion

1635–45; < Latin occlūs(us) (past participle of occlūdere to occlude) + -ion
Related formsoc·clu·sal [uh-kloo-suh l, -zuh l] /əˈklu səl, -zəl/, adjectivenon·oc·clu·sion, nounpre·oc·clu·sion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-occlusion


  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
Derived Formsocclusal (əˈkluːsəl), adjective
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 non-occlusion



1640s, from Medieval Latin occlusionem (nominative occlusio), noun of action from past participle stem of Latin occludere (see occlude). Dentistry sense is from 1880.

Online Etymology Dictionary, © 2010 Douglas Harper

non-occlusion in Medicine


  1. The act of occluding or the state of being occluded.
  2. An obstruction or 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.

non-occlusion in Science


  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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.