Etymology
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occlusion (n.)

"act or fact of being stopped up," 1640s, from Medieval Latin occlusionem (nominative occlusio), noun of action from past-participle stem of Latin occludere (see occlude). Dentistry sense "position of the two sets of teeth relative to each other when the mouth is closed" is from 1880.

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Definitions of occlusion

occlusion (n.)
closure or blockage (as of a blood vessel);
occlusion (n.)
(meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft;
Synonyms: occluded front
occlusion (n.)
(dentistry) the normal spatial relation of the teeth when the jaws are closed;
occlusion (n.)
an obstruction in a pipe or tube;
Synonyms: blockage / block / closure / stop / stoppage
occlusion (n.)
the act of blocking;
Synonyms: blockage / closure
From wordnet.princeton.edu