Medical Definition of occlusion
1: the act of occluding or the state of being occluded : a shutting off or obstruction of something <a coronary occlusion>; especially : a blocking of the central passage of one reflex by the passage of another
2a: the bringing of the opposing surfaces of the teeth of the two jaws into contact; also : the relation between the surfaces when in contactb: the transient approximation of the edges of a natural opening <occlusion of the eyelids>
3: sorption; especially : sorption of gases
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