Definition of occlusion
a
:the complete obstruction of the breath passage in the articulation of a speech sound
b
:the bringing of the opposing surfaces of the teeth of the two jaws into contact;
also
:the relation between the surfaces when in contact
c
:the inclusion or sorption of gas trapped during solidification of a material
2
:the front formed by a cold front overtaking a warm front and lifting the warm air above the earth's surface
