#1 occlusion n. closure or blockage (as of a blood vessel). wn
#2 occlusion n. [occluded front] (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft. wn
#3 occlusion n. (dentistry) the normal spatial relation of the teeth when the jaws are closed. wn
#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 occlusion n. [blockage, closure] the act of blocking. wn
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