occlusion in WordNet English dictionary

1. an obstruction in a pipe or tube
   "we had to call a plumber to clear out the blockage in the drainpipe"
   blockage  block  closure  occlusion  stop  stoppage 
   
2. the act of blocking
   blockage  closure  occlusion 
   
3. (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft
   occluded front  occlusion 
   
4. (dentistry) the normal spatial relation of the teeth when the jaws are closed
   occlusion 
   
5. closure or blockage (as of a blood vessel)
   occlusion