occlusion

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

(noun) (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft. Synonyms: occluded front.

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

(noun) an obstruction in a pipe or tube. Synonyms: blockage, block, closure, stop, stoppage. Example: "We had to call a plumber to clear out the blockage in the drainpipe."

(noun) the act of blocking. Synonyms: blockage, closure.