Occlusion

n.	1.	The act of occluding, or the state of being occluded. Constriction and occlusion of the orifice. - Howell.
	2.	(Med.) The transient approximation of the edges of a natural opening; imperforation. Occlusion of gases (Chem. & Physics) the phenomenon of absorbing gases, as exhibited by platinum, palladium, iron, or charcoal; thus, palladium absorbs, or occludes, nearly a thousand times its own volume of hydrogen, and in this case a chemical compound seems to be formed.

Noun	1.	occlusion - closure or blockage (as of a blood vessel)
	2.	occlusion - (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft Synonyms: occluded front
	3.	occlusion - (dentistry) the normal spatial relation of the teeth when the jaws are closed
	4.	occlusion - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe" Synonyms: blockage, stoppage, closure, block, stop
	5.	occlusion - the act of blocking Synonyms: blockage, closure

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