Webster's English Dictionary

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occlusion

oc.clu.sion \*-'klu:-zh*n\ n [prob. fr. (assumed) NL occlusion-, occlusio, 
   fr. L occlusus,] pp. of occludere 1: the act of occluding or the state of 
   being occluded : as  1a: the complete obstruction of the breath passage in 
   the articulation of a  speech sound 1b: the bringing of the opposing 
   surfaces of the teeth of the two jaws into  contact; also : the relation 
   between the surfaces when in contact 2: the front formed by a cold front 
   overtaking a warm front and lifting the  warm air above the earth's surface