OCCLUSION

noun Etymology: Latin occludere Date: circa 1645 the act of occluding ; the state of being occluded: as, the complete obstruction of the breath passage in the articulation of a speech sound, the bringing of the opposing surfaces of the teeth of the two jaws into contact, the inclusion or sorption of gas trapped during solidification of a material, the front formed by a cold front overtaking a warm front and lifting the warm air above the earth's surface