occlusion

Noun

Synonyms: occluded front blockage block closure stop stoppage

WordNet 3.0

Noun (5)

closure or blockage (as of a blood vessel)
(meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloftSynonyms: occluded front
(dentistry) the normal spatial relation of the teeth when the jaws are closed
an obstruction in a pipe or tube“we had to call a plumber to clear out the blockage in the drainpipe”Synonyms: blockage block closure stop stoppage
the act of blockingSynonyms: blockage closure

Webster's Dictionary (GCIDE)

Occlusion \Oc*clu"sion\, n. [See Occlude.]

1.The act of occluding, or the state of being occluded. [1913 Webster]

Constriction and occlusion of the orifice.— Howell.[1913 Webster]

2.(Med.) The transient approximation of the edges of a natural opening; imperforation. --Dunglison. [1913 Webster]

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. [1913 Webster]