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effect British & World English

A change which is a result or consequence of an action or other cause

Bohr effect British & World English

A decrease in the amount of oxygen associated with hemoglobin and other respiratory compounds in response to a lowered blood pH resulting from an increased concentration of carbon dioxide in the blood

for effect in effect British & World English

In order to impress people

take effect in effect British & World English

Come into force; start to apply

for effect British & World English

In order to impress people

take effect British & World English

Come into force; start to apply

Hall effect British & World English

The production of a potential difference across an electrical conductor when a magnetic field is applied in a direction perpendicular to that of the flow of current

halo effect British & World English

The tendency for an impression created in one area to influence opinion in another area

side effect British & World English

A secondary, typically undesirable effect of a drug or medical treatment

skin effect British & World English

The tendency of a high-frequency alternating current to flow through only the outer layer of a conductor

Kerr effect British & World English

The rotation of the plane of polarization of light when reflected from a magnetized surface

Auger effect British & World English

An effect whereby an atom which has been ionized by removal of an electron from an inner shell loses energy by emitting an electron from an outer shell

after-effect British & World English

An effect that follows after the primary action of something

Barnum effect British & World English

The tendency to accept as true types of information such as character assessments or horoscopes, even when the information is so vague as to be worthless

double effect British & World English

The good and bad effect of an action, compared according to a principle which seeks to justify the action if the bad effect, though foreseen, is outweighed by the good effect

domino effect British & World English

The effect of the domino theory

ground effect British & World English

The effect of added aerodynamic buoyancy produced by a cushion of air below a vehicle moving close to the ground

Magnus effect British & World English

The force exerted on a rapidly spinning cylinder or sphere moving through air or another fluid in a direction at an angle to the axis of spin. This force is responsible for the swerving of balls when hit or thrown with spin

notch effect British & World English

The increase in the susceptibility of a specimen to fracture caused by a notch

pinch effect British & World English

The constriction of a plasma through which a large electric current is flowing, caused by the attractive force of the current’s own magnetic field

Raman effect British & World English

A change of wavelength exhibited by some of the radiation scattered in a medium. The effect is specific to the molecules which cause it, and so can be used in spectroscopic analysis

ripple effect British & World English

The continuing and spreading results of an event or action

stage effect British & World English

An effect produced by the lighting, sound, or scenery in a play, movie, etc.

Stark effect British & World English

The splitting of a spectrum line into several components by the application of an electric field

sound effect British & World English

A sound other than speech or music made artificially for use in a play, film, or other broadcast production

Joule effect British & World English

The heating that occurs when an electric current flows through a resistance

Zeeman effect British & World English

The splitting of a spectrum line into several components by the application of a magnetic field

Compton effect British & World English

An increase in wavelength of X-rays or gamma rays that occurs when they are scattered

Coriolis effect British & World English

An effect whereby a mass moving in a rotating system experiences a force (the Coriolis force) acting perpendicular to the direction of motion and to the axis of rotation. On the earth, the effect tends to deflect moving objects to the right in the northern hemisphere and to the left in the southern and is important in the formation of cyclonic weather systems

Doppler effect British & World English

An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers

Faraday effect British & World English

The rotation of the plane of polarization of electromagnetic waves in certain substances in a magnetic field

founder effect British & World English

The reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors

Meissner effect British & World English

The expulsion of magnetic flux when a material becomes superconducting in a magnetic field

placebo effect British & World English

A beneficial effect produced by a placebo drug or treatment, which cannot be attributed to the properties of the placebo itself, and must therefore be due to the patient’s belief in that treatment

Peltier effect British & World English

An effect whereby heat is given out or absorbed when an electric current passes across a junction between two materials

Schottky effect British & World English

The increase in thermionic emission from a solid surface due to the presence of an external electric field

special effect British & World English

An illusion created for films and television by props, camerawork, computer graphics, etc.

butterfly effect British & World English

(With reference to chaos theory) the phenomenon whereby a minute localized change in a complex system can have large effects elsewhere

to that effect in effect British & World English

Having that result, purpose, or meaning

to that effect British & World English

Having that result, purpose, or meaning

greenhouse effect British & World English

The trapping of the sun’s warmth in a planet’s lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet’s surface

Mössbauer effect British & World English

An effect in which certain atomic nuclei bound in a crystal emit gamma rays of sharply defined frequency which can be used as a probe of energy levels in other nuclei

Hawthorne effect British & World English

The alteration of behaviour by the subjects of a study due to their awareness of being observed

cause and effect in cause British & World English

The principle of causation

cause and effect British & World English

The principle of causation

come into effect in effect British & World English

Come into force; start to apply

with effect from in effect British & World English

Starting from (a specified date)

come into effect British & World English

Come into force; start to apply


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