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Reaction   /riˈækʃən/   Listen
noun
Reaction  n.  
1.
Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action.
2.
(Chem.) The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame.
3.
(Med.) An action induced by vital resistance to some other action; depression or exhaustion of vital force consequent on overexertion or overstimulation; heightened activity and overaction succeeding depression or shock.
4.
(Mech.) The force which a body subjected to the action of a force from another body exerts upon the latter body in the opposite direction. "Reaction is always equal and opposite to action, that is to say, the actions of two bodies upon each other are always equal and in opposite directions."
5.
(Politics) Backward tendency or movement after revolution, reform, or great progress in any direction. "The new king had, at the very moment at which his fame and fortune reached the highest point, predicted the coming reaction."
6.
(Psycophysics) A regular or characteristic response to a stimulation of the nerves.
7.
An action by a person or people in response to an event. The reaction may be primarily mental (" a reaction of surprise") but is usually manifested by some activity.
Reaction time (Physiol.), in nerve physiology, the interval between the application of a stimulus to an end organ of sense and the reaction or resulting movement; called also physiological time.
Reaction wheel (Mech.), a water wheel driven by the reaction of water, usually one in which the water, entering it centrally, escapes at its periphery in a direction opposed to that of its motion by orifices at right angles, or inclined, to its radii.





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"Reaction" Quotes from Famous Books



... life (Historia magistra vitae), lessons directly profitable to individuals and peoples; the conditions under which human actions are performed are rarely sufficiently similar at two different moments for the "lessons of history" to be directly applicable. But it is an error to say, by way of reaction, that "the distinguishing feature of history is to be good for nothing."[232] ...
— Introduction to the Study of History • Charles V. Langlois
 
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... Carthaginian presbyter. He speaks in more exalted terms of the authority of bishops than any preceding writer. It is not improbable that the attempts of his discontented elders to curb his power inflamed his old aristocratic hauteur, and thus led to a reaction; and that, supported by the popular voice, he was tempted absurdly to magnify his office, and to stretch his prerogative beyond the bounds of its legitimate exercise. His name carried with it great influence, and from his ...
— The Ancient Church - Its History, Doctrine, Worship, and Constitution • W.D. [William Dool] Killen
 
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... I am by no means sure that he does not pay me that compliment already, with some excuse, perhaps, in view of the 'Song of the Overlord' and all my wild talk. Well, after such a night as I had spent anyone might be excused for talking foolishly. It is the reaction from never expecting to talk again at all. The chief advantage of a diary is that one may indulge in the luxury of telling the actual truth. So I will say that I feel as though I had known him always; always—and ...
— Stella Fregelius • H. Rider Haggard
 
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... of scriptural interpretation in the university. In 1563 he was nominated one of the Belgian representatives at the council of Trent, but arrived too late to take an important part in its deliberations. At Louvain, however, he obtained a great name as a leader in the anti-scholastic reaction of the 16th century. The champions of this reaction fought under the banner of St Augustine; and Baius' Augustinian predilections brought him into conflict with Rome on questions of grace, free-will and the like. In 1567 Pius V. condemned ...
— Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 - "Baconthorpe" to "Bankruptcy" • Various
 
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... midnight, when Henry at last escaped, to talk it all over with the stars. The evening had naturally puzzled him, as a man will always be puzzled who has developed under the influence of the main tendencies of his generation, and who finds himself suddenly in a backwater of fanciful reaction. Henry, in his simple way, was a thinker and a radical, and he had nourished himself on the great main-road masters of English literature. He had followed the lead of modern philosophers and scientists, and had arrived at a mystical agnosticism,—the first step ...
— Young Lives • Richard Le Gallienne
 
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