noun.
In dentistry, the fitting into each other of the cusps of the opposing teeth in the upper and lower jaws.
noun.
A shutting up; a closing; specifically, in pathology, the total or partial closure of a vessel, cavity, or hollow organ; imperforation.
noun.
In physics and chem., the act of occluding, or absorbing and concealing; the state of being occluded. See occlude.