special theory of relativity
noun Physics.
See under relativity(def 2).
Words nearby special theory of relativity
special session, special sort, special staff, special team, special term, special theory of relativity, special-interest group, special-order, specialism, specialist, specialist registrar
Origin of special theory of relativity
First recorded in 1915–20
Also called special relativity.
Definition for special relativity (2 of 2)
relativity
[ rel-uh-tiv-i-tee ]
/ ˌrɛl əˈtɪv ɪ ti /
noun
the state or fact of being relative.
Physics. a theory, formulated essentially by Albert Einstein, that all motion must be defined relative to a frame of reference and that space and time are relative, rather than absolute concepts: it consists of two principal parts. The theory dealing with uniform motion (special theory of relativity or special relativity) is based on the two postulates that physical laws have the same mathematical form when expressed in any inertial system, and the velocity of light is independent of the motion of its source and will have the same value when measured by observers moving with constant velocity with respect to each other. Derivable from these postulates are the conclusions that there can be no motion at a speed greater than that of light in a vacuum, mass increases as velocity increases, mass and energy are equivalent, and time is dependent on the relative motion of an observer measuring the time. The theory dealing with gravity (general theory of relativity or general relativity) is based on the postulate that the local effects of a gravitational field and of acceleration of an inertial system are identical.
dependence of a mental state or process upon the nature of the human mind: relativity of values; relativity of knowledge.
OTHER WORDS FROM relativity
non·rel·a·tiv·i·ty, nounDictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for special relativity (1 of 2)
relativity
/ (ˌrɛləˈtɪvɪtɪ) /
noun
either of two theories developed by Albert Einstein, the special theory of relativity, which requires that the laws of physics shall be the same as seen by any two different observers in uniform relative motion, and the general theory of relativity which considers observers with relative acceleration and leads to a theory of gravitation
philosophy dependence upon some variable factor such as the psychological, social, or environmental contextSee relativism
the state or quality of being relative
British Dictionary definitions for special relativity (2 of 2)
special theory of relativity
noun
the theory proposed in 1905 by Einstein, which assumes that the laws of physics are equally valid in all nonaccelerated frames of reference and that the speed of electromagnetic radiation in free space has the same value for all inertial observers. It leads to the idea of a space-time continuum and the equivalence of mass and energy. In combination with quantum mechanics it forms the basis of the theory of elementary particlesAlso called: special relativity See also general theory of relativity
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Science definitions for special relativity (1 of 2)
Special Relativity
[ spĕsh′əl ]
The theory of space and time developed by Albert Einstein, based on the postulates that all the laws of physics are equally valid in all reference frames moving at a constant speed relative to each other (that is, in all inertial frames), and that the speed of light is observed to be the same in all reference frames. To compare measurements of length or time made in different inertial frames, their values must be regarded as components of vectors in a 4-dimensional space called Minkowski space-time. Different frames are related to each other mathematically by Lorentz transformations. Special Relativity predicts that all massless particles, such as photons, are always necessarily moving at the speed of light, while all particles with mass are always necessarily moving slower than the speed of light, and only particles with mass can be at rest. The theory also states that velocities are not simply additive. For example, if an object (such as a spacecraft) moving with velocity v1 observes another faster object (such as a rocket fired from the spacecraft) moving ahead of it in the same direction with velocity v2, an observer at rest observes the faster object moving at velocity that is not just the sum of v1 and v2, but at the slower speed v1 + v21 + v1v2c2. See also General Relativity time dilation.
Science definitions for special relativity (2 of 2)
relativity
[ rĕl′ə-tĭv′ĭ-tē ]
Either of two theories in physics developed by Albert Einstein, General Relativity or Special Relativity. See Notes at Einstein gravity space-time.
Other words from relativity
relativistic adjectiveThe American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Culture definitions for special relativity
relativity
A theory concerning time, space, and the motion of objects, proposed first in 1905 by Albert Einstein in his special theory of relativity.
The “special theory of relativity” is based on the principle of special relativity, which states that all observers moving at constant velocities with respect to each other should find the same laws of nature operating in their frames of reference. It follows from this principle that the speed of light would have to appear to be the same to every observer. The theory predicts that moving clocks will appear to run slower than stationary ones (see time dilation), that moving objects will appear shorter and heavier than stationary ones, and that energy and mass are equivalent (see E = mc2). There is abundant experimental confirmation of these predictions.
The general theory of relativity is the modern theory of gravitation, proposed in 1915, also by Albert Einstein. The central point of the theory is the principle of general relativity, which states that all observers, regardless of their state of motion, will see the same laws of physics operating in the universe. The most famous prediction of the theory is that light rays passing near the sun will be bent — a prediction that has been well verified.
notes for relativity
The special and general theories of relativity have had important implications for thought in general. They show that no frame of reference for observation of nature is more correct than any other.
notes for relativity
It is important to distinguish between the theory of relativity, in which the laws of nature are the same for all observers anywhere in the universe, and the philosophical doctrine of relativism, which holds that there are no absolute truths. The similarity in their names has been a source of confusion.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.