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Relativity   Listen
noun
relativity  n.  
1.
The state of being relative; as, the relativity of a subject.
2.
One of two theories (also called theory of relativity) proposed by Albert Einstein, the special theory of relativity, or the general theory of relativity. The special theory of relativity or special relativity is based on the proposition that the speed of light is a constant no matter how observed, and is independent of the motion of the observer. From this follows several principles, such as the increase of mass with velocity (which has been confirmed: see relativistic mass equation) and the impossibility of acceleration to a speed greater than that of light; the equivalence of mass and energy, expressed by the famous equation E = mc^(2); and time dilation, which is the apparent slowing of a clock in a system, as observed by an observer in a system moving relative to the clock. The general theory of relativity is based on the proposition that there is no physical difference between gravitational force and the force produced by acceleration. From this follow several results, of which the bending of light rays in a gravitational field and the equivalence of the inertial and gravitational masses have been verified. The possible existence of black holes (believed by many astronomers to have been adequately proven) is another consequence of the theory.






Collaborative International Dictionary of English 0.48








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"Relativity" Quotes from Famous Books



... Herbert Spencer writes[1] as follows: "When we are taught that a piece of matter, regarded by us as existing externally, cannot be really known, but that we can know only certain impressions produced on us, we are yet, by the relativity of thought, compelled to think of these in relation to a cause—the notion of a real existence which generated these impressions becomes nascent. If it be proved that every notion of a real existence which we can frame is inconsistent with itself,—that matter, however conceived by us, cannot ...
— An Introduction to Philosophy • George Stuart Fullerton

... remote supports. In our day, when each science has become so complicated, so obese, that a man's lifetime may be spent in exercising round one of them, there are hardly any generalizers or observers fit to estimate their relativity, except among the two classes called by the world idlers and ...
— Lippincott's Magazine of Popular Literature and Science, Vol. XII, No. 29. August, 1873. • Various

... to say, we have been disappointed. Not only is Mr. Mill's attack on Hamilton's philosophy, with the exception of some minor details, unsuccessful; but we are compelled to add, that with regard to the three fundamental doctrines of that philosophy—the Relativity of Knowledge, the Incognisability of the Absolute and Infinite, and the distinction between Reason and Faith—Mr. Mill has, throughout his criticism, altogether missed the meaning of the theories he is attempting ...
— The Philosophy of the Conditioned • H. L. Mansel

... Discussions in Philosophy; and though I knew that his general mode of treating the facts of mental philosophy differed from that of which I most approved, yet his vigorous polemic against the later Transcendentalists, and his strenuous assertion of some important principles, especially the Relativity of human knowledge, gave me many points of sympathy with his opinions, and made me think that genuine psychology had considerably more to gain than to lose by his authority and reputation. His Lectures and the Dissertations on Reid dispelled this illusion: and even the Discussions, ...
— Autobiography • John Stuart Mill

... of his Lectures has yet been produced. Of living thinkers we do not speak; but the same great truth formed the groundwork of all the speculative philosophy of Bentham, and pre-eminently of James Mill: and Sir William Hamilton's famous doctrine of the Relativity of human knowledge has guided many to it, though we cannot credit Sir William Hamilton himself with having understood the principle, or been willing to assent ...
— Auguste Comte and Positivism • John-Stuart Mill

... places. The character of the meshes in that wider network of roads that will be the country, as distinguished from the urban district, will vary with the soil, the climate and the tenure of the land—will vary, too, with the racial and national differences. But throughout all that follows, this mere relativity of the new sort of town to the new sort of country over which the new sorts of people we are immediately to consider will be scattered, must be ...
— Anticipations - Of the Reaction of Mechanical and Scientific Progress upon - Human life and Thought • Herbert George Wells

... opposition to Anarchism is that it brings to light the relation between so-called intelligence and ignorance. And yet this is not so very strange when we consider the relativity of all things. The ignorant mass has in its favor that it makes no pretense of knowledge or tolerance. Acting, as it always does, by mere impulse, its reasons are like those of a child. "Why?" ...
— Anarchism and Other Essays • Emma Goldman

... it may get harder to push? You know the increase of mass with velocity. You can't take one-half of the relativity theory without the other. And they've actually measured the increase of ...
— Out Around Rigel • Robert H. Wilson



Words linked to "Relativity" :   natural philosophy, principle of relativity, Einstein's special theory of relativity, special relativity theory, event, general theory of relativity, physics, general relativity, relativity theory, theory of relativity, Einstein's theory of relativity



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