oc·clu·sion
n 1 : the act of occluding or the state of being occluded : a shutting off or obstruction of something <a coronary > : esp : a blocking of the central passage of one reflex by the passage of another 2 a : the bringing of the opposing surfaces of the teeth of the two jaws into contact : also : the relation between the surfaces when in contact b : the transient approximation of the edges of a natural opening < of the eyelids> 3 : SORPTION : esp : sorption of gases .
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