Occlusion

[ə'kluːʒ(ə)n] or [ə'kluʒən]

(noun.) (dentistry) the normal spatial relation of the teeth when the jaws are closed.

(noun.) closure or blockage (as of a blood vessel).

Inputed by Anna--From WordNet

(n.) The act of occluding, or the state of being occluded.

(n.) The transient approximation of the edges of a natural opening; imperforation.

Typed by Cyril