definition of
occlusion

[1] #1 occlusion n. closure or blockage (as of a blood vessel). wn

[2] #2 occlusion n. [occluded front] (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft. wn

[3] #3 occlusion n. (dentistry) the normal spatial relation of the teeth when the jaws are closed. wn

[4] #4 occlusion n. [blockage, block, closure, stop, stoppage] an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe". wn

[5] #5 occlusion n. [blockage, closure] the act of blocking. wn