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From The Collaborative International Dictionary of English v.0.48:
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]