Displacement /(?)/

Dis·place·ment

Displacement

n.
  1. The act of displacing, or the state of being displaced; a putting out of place.
    Unnecessary displacement of funds.
    — A. Hamilton.
    The displacement of the sun by parallax.
  2. The quantity of anything, as water, displaced by a floating body, as by a ship, the weight of the displaced liquid being equal to that of the displacing body.
  3. The process of extracting soluble substances from organic material and the like, whereby a quantity of saturated solvent is displaced, or removed, for another quantity of the solvent. (Chem.)

Phrases & Compounds
Piston displacement
the volume of the space swept through, or weight of steam, water, etc., displaced, in a given time, by the piston of a steam engine or pump.