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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
   - occluded front
    
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 occlusion in the drainpipe";
   - blockage, block, closure, stop, stoppage
    
5. The act of blocking
   - blockage, closure

Derived forms: occlusions

Type of: attack, front, impediment, impedimenta, obstructer, obstruction, obstructor, position, spatial relation

Encyclopedia: Occlusion