occlusion

英[ə'kluːʒ(ə)n] 美[ə'kluʒən]

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

2. (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft

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

4. an obstruction in a pipe or tube;

"we had to call a plumber to clear out the blockage in the drainpipe"

5. the act of blocking