1. The act of displacing. 2. The condition of having been displaced. 3. A reaction in which an atom, a radical, or a molecule replaces another in a compound. 4. The weight or volume of a fluid displaced by a floating body, used especially as a measurement of the weight or bulk of ships. 5. A vector or the magnitude of a vector from the initial position to a subsequent position assumed by a body. 6. The relative movement between the two sides of a fault. 7. dislocation 8. A 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.