Webster's English Dictionary

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displacement

dis.place.ment \dis-'pla--sm*nt\ n 1: the act or process of displacing : 
   the state of being displaced  2a: the volume or weight of a fluid displaced 
   by a floating body of equal w eight 2b: the difference between the initial 
   position of a body and any later pos ition 2c: the volume displaced by a 
   piston in a single stroke