occlusion

noun

1. 1

   the act of blocking

2. 2

   an obstruction in a pipe or tube

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

3. 3

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

4. 4

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

5. 5

   closure or blockage (as of a blood vessel)