dis·place·ment 
(dĭs-plāsmənt)
(dĭs-plāsmənt)n.
1.
a. The act of displacing.
b. The condition of having been displaced.
2. Chemistry A reaction in which an atom, radical, ion, or molecule replaces another in a compound.
3. Physics
a. A vector or the magnitude of a vector from the initial position to a subsequent position assumed by a body.
b. The weight or volume of a fluid displaced by a floating body, used especially as a measurement of the weight or bulk of ships.
4. The volume displaced by a single stroke of a piston in an engine or pump.
5. Geology
a. The relative movement between the two sides of a fault.
b. The distance between the two sides of a fault. Also called dislocation.
6. Psychiatry A psychological defense mechanism in which there is an unconscious shift of emotions, affect, or desires from the original object to a more acceptable or immediate substitute.