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
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Merriam-Webster unabridged
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Time Traveler for occlusion
The first known use of occlusion was circa 1645
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