Physics

• Displacement (vector)
  Displacement (vector)
  A displacement is the shortest distance from the initial to the final position of a point P. Thus, it is the length of an imaginary straight path, typically distinct from the path actually travelled by P...
  
  , the difference between the path of the initial and final position covered by a moving object
  • Particle displacement
    Particle displacement
    Particle displacement or particle amplitude is a measurement of distance of the movement of a particle from its equilibrium position in a medium as it transmits a wave....
    
    , a measurement of distance of the movement of a particle in a medium as it transmits a wave
  • Displacement field (mechanics)
    Displacement field (mechanics)
    A displacement field is an assignment of displacement vectors for all points in a region or body that is displaced from one state to another. A displacement vector specifies the position of a point or a particle in reference to an origin or to a previous position...
    
    , 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
  Wien's displacement law
  Wien's displacement law states that the wavelength distribution of thermal radiation from a black body at any temperature has essentially the same shape as the distribution at any other temperature, except that each wavelength is displaced on the graph...
  
  , a relation concerning the spectral distribution of blackbody radiation
• Angular displacement
  Angular displacement
  Angular displacement of a body is the angle in radians through which a point or line has been rotated in a specified sense about a specified axis....
  
  , a change in orientation of a rigid body, the amount of rotation about a fixed axis

Engineering

• Engine displacement
  Engine displacement
  Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...
  
  , the total volume of air/fuel mixture an engine can draw in during one complete engine cycle
• Displacement (fluid)
  Displacement (fluid)
  In fluid mechanics, displacement occurs when an object is immersed in a fluid, pushing it out of the way and taking its place. The volume of the fluid displaced can then be measured, as in the illustration, and from this the volume of the immersed object can be deduced .An object that sinks...
  
  , an object immersed in a fluid pushes the fluid out of the way
• Positive displacement meter
  Positive displacement meter
  A positive displacement meter is a type of flow meter that requires the fluid being measured to mechanically displace components in the meter in order for any fluid flow to occur. Positive displacement flowmeters make volumetric flow measurements taking finite increments or volumes of the fluid...
  
  , 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)
    Displacement (ship)
    A ship's displacement is its weight at any given time, generally expressed in metric tons or long tons. The term is often used to mean the ship's weight when it is loaded to its maximum capacity. A number of synonymous terms exist for this maximum weight, such as loaded displacement, full load...
    
    , several related measurements of a ship's weight
• Insulation displacement connector, a type of electrical connector
• Displacement mapping
  Displacement mapping
  Displacement mapping is an alternative computer graphics technique in contrast to bump mapping, normal mapping, and parallax mapping, using a texture- or height map to cause an effect where the actual geometric position of points over the textured surface are displaced, often along the local...
  
  , a technique in 3D computer graphics

Chemistry

• Single displacement reaction
  Single displacement reaction
  A single-displacement reaction, also called single-replacement reaction, is a type of oxidation-reduction chemical reaction when an element or ion moves out of one compound and into another. This is usually written as...This will occur if A is more reactive than B...
  
  , 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
  Radioactive displacement law of Fajans and Soddy
  The law of radioactive displacements, also known as Fajans and Soddy law, in radiochemistry and nuclear physics, is a rule governing the transmutation of elements during radioactive decay...
  
  , elements/isotopes created during radioactive decay

Social sciences

• Displacement (linguistics)
  Displacement (linguistics)
  In linguistics, displacement is the capability of human language to communicate about things that are not immediately present.In 1960, Charles F. Hockett proposed displacement as one of 13 "design-features" that distinguish human language from animal language:...
  
  , the ability of human language to communicate ideas that are remote in time and/or space
• Forced migration
  Forced migration
  Forced migration refers to the coerced movement of a person or persons away from their home or home region...
  
  , by persecution or violence
• Displacement (psychology)
  Displacement (psychology)
  In Freudian psychology, displacement is an unconscious defense mechanism whereby the mind redirects effects from an object felt to be dangerous or unacceptable to an object felt to be safe or acceptable...
  
  , a sub-conscious defense mechanism
• Displacement (parapsychology), a statistical or qualitative correspondence between targets and responses.
• Development-induced displacement
  Development-induced displacement
  Development-induced displacement is the forcing of communities and individuals out of their homes, often also their homelands, for the purposes of economic development. It is a subset of forced migration...
  
  , the displacement of population for economic development