What do a.m. and p.m. stand for?


[uh-kloo-zhuh n] /əˈklu ʒən/
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.
  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 forms
[uh-kloo-suh l, -zuh l] /əˈklu səl, -zəl/ (Show IPA),
nonocclusion, noun
preocclusion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for occlusion
  • 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.
  • He was found to have a central retina vein occlusion in that eye and glaucoma in both eyes.
  • Often, in the later stages of a storm's life cycle, a frontal occlusion occurs.
  • There are so many perspective, stereo, and occlusion cues.
British Dictionary definitions for occlusion


the act or process of occluding or the state of being occluded
(meteorol) another term for occluded front
(dentistry) the normal position of the teeth when the jaws are closed
(phonetics) the complete closure of the vocal tract at some point, as in the closure prior to the articulation of a plosive
Derived Forms
occlusal (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
Cite This Source
Word Origin and History for 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
Cite This Source
occlusion in Medicine

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.
Cite This Source
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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for occlusion

Some English speakers likely know this word

Word Value for occlusion

Scrabble Words With Friends

Nearby words for occlusion