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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.






Collaborative International Dictionary of English 0.48








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"Reaction" Quotes from Famous Books



... behave in the most intolerant manner, and would introduce into this country a system of proscription quite as bad as anything of the kind that was known to the Romans as one of the most frightful consequences of their great civil contests. This would lead to reaction, and every Presidential election might be followed by deeds that would make our country a by-word, a hissing, and a reproach among the nations. There would be an end to all those fine hopes that are entertained that we shall speedily recover from the effects of the war, let peace once ...
— The Atlantic Monthly, Vol. 13, No. 79, May, 1864 • Various

... the same thing, that the same force is conserved always: but this axiom of higher philosophy cannot be demonstrated geometrically. One may again apply other principles of like nature, for instance the principle that action is always equal to reaction, one which assumes in things a distaste for external change, and cannot be derived either from extension or impenetrability; and that other principle, that a simple movement has the same properties as those which might belong to a compound movement such ...
— Theodicy - Essays on the Goodness of God, the Freedom of Man and the Origin of Evil • G. W. Leibniz

... in the reign of Charles II. and James II., were shockingly dissolute, and in literature, as in life, the reaction against Puritanism went to great extremes. The social life of the time is faithfully reflected in the diary of Samuel Pepys. He was a simple-minded man, the son of a London tailor, and became, himself, ...
— Brief History of English and American Literature • Henry A. Beers

... to Hale's ideal crusade. Here he was—an honest, respectable citizen—engaged as simple accessory to a lawless vendetta originating at a gambling table! When the first shock was over that grim philosophy which is the reaction of all imaginative and sensitive natures came to his aid. He felt better; oddly enough he began to be conscious that he was thinking and acting like his companions. With this feeling a vague sympathy, before absent, faintly showed itself in their actions. The Sharpe's rifle put into his hands by ...
— Snow-Bound at Eagle's • Bret Harte

... was an after-thought. Whittier knew a lady who read the story "to some twenty young ladies, daughters of slave-holders, near New Orleans and amid the scenes described in it, and they with one accord pronounced it true." It was not till the sale of the book had run to over 100,000 copies that a reaction set in and then, strange to say, the note of warning was sounded by that infallible authority upon American affairs, the ...
— Daughters of the Puritans - A Group of Brief Biographies • Seth Curtis Beach


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