Main Entry: oc·clu·sion

Pronunciation: \ə-ˈklü-zhən\

Function: noun

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
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 <occlusion of the eyelids>
3 : sorption ; especially : sorption of gases