occlusiontop: in a cold-front occlusion cold air moves under a mass of warm air and under the cool air in frontbottom: in a warm-front occlusion cool air moves under a mass of warm air while riding over the cold air in frontoc·clu·sion (?-klo?o?zh?n)n.1. a. The process of occluding.b. Something that occludes.2. Medicine An obstruction of an anatomical passage, as of an artery by plaque.3. Dentistry The alignment of the teeth of the upper and lower jaws when brought together.4. Meteorology a. The process of occluding air masses.b. An occluded front.5. Linguistics Closure at some point in the vocal tract that blocks the flow of air in the production of an oral or nasal stop.[From Latin occl?sus, past participle of occl?dere, to occlude; see occlude.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.occlusion (??klu???n) n1. the act or process of occluding or the state of being occluded2. (Physical Geography) meteorol another term for occluded front3. (Dentistry) dentistry the normal position of the teeth when the jaws are closed4. (Phonetics & Phonology) phonetics the complete closure of the vocal tract at some point, as in the closure prior to the articulation of a plosive occlusal adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014oc?clu?sion (??klu ??n) n. 1. the act of occluding or the state of being occluded. 2. the fitting together of the teeth of the upper and lower jaws when the jaws are closed. 3. Phonet. momentary complete closure at some area in the vocal tract. 4. occluded front. [1635?45;