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Theory   /θˈɪri/  /θˈiəri/   Listen
Theory

noun
(pl. theories)
1.
A well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena.  "True in fact and theory"
2.
A tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena.  Synonyms: hypothesis, possibility.  "He proposed a fresh theory of alkalis that later was accepted in chemical practices"
3.
A belief that can guide behavior.  "They killed him on the theory that dead men tell no tales"



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"Theory" Quotes from Famous Books



... This theory is confirmed by discoveries in the prehistoric cemeteries of the Viminal and Esquiline hills, which contain coffins as well as cineraria, or ash-urns. The discoveries have been published only in a fragmentary way, so that we cannot yet follow their development stage by stage, and ...
— Pagan and Christian Rome • Rodolfo Lanciani

... Exhalation, occasion'd by the Adustion of their Sulphur, which (for the Reasons lately mention'd I should rather call their Oyly parts;) yet still this account is applicable but to some Particular Bodies, and will afford us no General Theory of Blackness. For if, for example, White Harts-horn, being, in Vessels well luted to each other, expos'd to the fire, be said to turn Black by the Infection of its own Smoak, I think I may justly demand, what it is that makes the Smoak or Soot it self Black, since no Such Colour, but ...
— Experiments and Considerations Touching Colours (1664) • Robert Boyle

... Moussorgsky composed as though he had been born into a world in which there was no musical tradition, a world where, indeed, no fine musical literature, and only a few folk-songs and orthodox liturgical chants and Greek-Catholic scales existed. Toward musical theory he seems to have been completely indifferent. Only one rule he recognized, and that was, "Art is a means of speech between man and man, and not an end." He was self-taught, and actually invented an art of music with each step of composition. And what he produced, though it was not great in bulk, ...
— Musical Portraits - Interpretations of Twenty Modern Composers • Paul Rosenfeld

... So long as the separate organization of the members be not abolished; so long as it exists, by a constitutional necessity, for local purposes; though it should be in perfect subordination to the general authority of the union, it would still be, in fact and in theory, an association of states, or a confederacy. The proposed Constitution, so far from implying an abolition of the State governments, makes them constituent parts of the national sovereignty, by allowing them a direct representation in the Senate, and leaves in their ...
— The Federalist Papers

... single-taxer, who has just returned from Great Britain, believes that the English people is ready to listen to the principles of the single-tax theory. And when the New ...
— The Patient Observer - And His Friends • Simeon Strunsky


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