D defs.my
Entry 2 senses Webster, 1913

Occlusion

/ək-lo͞ozh'-ən/ · Oc·clu·sion · IPA /əˈkluː.ʒən/
01 n. The act of occluding, or the state of being occluded.
  1. 1.
    The act of occluding, or the state of being occluded.
    “Constriction and occlusion of the orifice.” Howell.
  2. 2.
    The transient approximation of the edges of a natural opening; imperforation.(Med.)
Phrases & compounds
Occlusion of gases — 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.