Mathematics and physics •
Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path covered to reach the final position is irrelevant. •
Particle displacement, a measurement of distance of the movement of a particle in a medium as it transmits a wave (represented in mathematics by the lower-case Greek letter ξ) •
Displacement field (mechanics), an assignment of displacement vectors for all points in a body that is displaced from one state to another •
Electric displacement field, as appears in Maxwell's equations •
Wien's displacement law, a relation concerning the spectral distribution of blackbody radiation •
Angular displacement, a change in orientation of a rigid body, the amount of rotation about a fixed axis.
Engineering •
Engine displacement, the total volume of air/fuel mixture an engine can draw in during one complete engine cycle •
Displacement (fluid), an object immersed in a fluid pushes the fluid out of the way •
Positive displacement meter, a pump or flow meter which processes a definite fluid volume per revolution • Displacement has several meanings related to ships and boats •
Displacement hull, where the moving hull's weight is supported by buoyancy alone and it must displace water from its path rather than planing on the water's surface •
Displacement speed, a rule of thumb for non planing watercraft to estimate their theoretical maximum speed •
Displacement (ship), the weight of a ship •
Insulation displacement connector, a type of electrical connector •
Displacement mapping, a technique in 3D computer graphics
Chemistry •
Single displacement reaction, a chemical reaction concerning the exchange of ions •
Double displacement reaction, a chemical reaction concerning the exchange of ions •
Radioactive displacement law of Fajans and Soddy, elements/isotopes created during radioactive decay
Geology • Earth Crustal Displacement, an aspect of the
Pole shift hypothesis ==Medicine==