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1. (n.) reaction
action in response to some influence, event, etc.:
the nation's reaction to the president's speech.
2. reaction
a physiological response to an action or condition.
3. reaction
a physiological change indicating sensitivity to foreign matter:
an allergic reaction.
4. reaction
an action in a reverse direction or manner.
5. reaction
a movement toward extreme political conservatism; a desire to return to an earlier system or order.
6. reaction
the reciprocal action of chemical agents upon each other; chemical change.
7. reaction
a process that, unlike a chemical reaction, has the power to change the nucleus of an atom, as radioactive decay, fission, or the like.
8. reaction
Mech. the instantaneous response of a system to an applied force, manifested as the exertion of a force equal in magnitude, but opposite in direction, to the applied force.
Etymology: (1635–45; on the model of react)
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| Definition of 'Reaction' |
Princeton's WordNet |
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1. (noun) chemical reaction, reaction
(chemistry) a process in which one or more substances are changed into others
"there was a chemical reaction of the lime with the ground water"
2. (noun) reaction
an idea evoked by some experience
"his reaction to the news was to start planning what to do"
3. (noun) reaction, response
a bodily process occurring due to the effect of some antecedent stimulus or agent
"a bad reaction to the medicine"; "his responses have slowed with age"
4. (noun) reaction
(mechanics) the equal and opposite force that is produced when any force is applied to a body
"every action has an equal and opposite reaction"
5. (noun) reaction
a response that reveals a person's feelings or attitude
"he was pleased by the audience's reaction to his performance"; "John feared his mother's reaction when she saw the broken lamp"
6. (noun) reaction
extreme conservatism in political or social matters
"the forces of reaction carried the election"
7. (noun) reaction
doing something in opposition to another way of doing it that you don't like
"his style of painting was a reaction against cubism"
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1. (noun) reaction
what sb says or does as a result of sth that happens
the public's reaction to her speech; The markets dropped in reaction to the news.; Her immediate reaction was to walk out.
2. reaction
reaction against
an action done in opposition to
a new generation's reaction against the spending habits of their parents
3. reaction
a change in the body as a response to a food, medicine, or other substance
an allergic reaction to strawberries; harmful reactions to the drug
4. reaction
reactions
sb's ability to act quickly in response
I tried to grab him but my reactions were too slow.
5. reaction
a chemical change that occurs when two or more substances are mixed
Gas is given off as the reaction occurs.
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| Definition of 'Reaction' |
Webster Dictionary |
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1. (noun) Reaction
any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action
2. (noun) Reaction
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. (noun) Reaction
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. (noun) Reaction
the force which a body subjected to the action of a force from another body exerts upon the latter body in the opposite direction
5. (noun) Reaction
backward tendency or movement after revolution, reform, or great progress in any direction
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Sense: the act of reacting
What was his reaction to your remarks?; I get a bad reaction from penicillin; I'd like to ask you for your reactions to these suggestions.
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 Afrikaans: reaksie |
 Arabic: رد فِعْل |
 Bulgarian: реагиране |
 Brazilian: reação |
 Czech: reakce, odpověď |
 German: die Reaktion |
 Danish: reaktion |
 Greek: αντίδραση |
 Spanish: reacción |
 Estonian: reaktsioon |
 Farsi: واکنش |
 Finnish: reaktio |
 French: réaction |
 Hebrew: תְגוּבָה |
 Hindi: प्रतिक्रिया |
 Croatian: reakcija |
 Hungarian: reagálás |
 Indonesian: reaksi |
 Icelandic: viðbragð |
 Italian: reazione |
 Japanese: 反応 |
 Korean: 반응 |
 Lithuanian: reakcija, atoveikis |
 Latvian: reakcija; atbilde |
 Malay: tindakan |
 Dutch: reactie |
 Norwegian: reaksjon |
 Polish: reakcja |
 Persian: واکنش |
 Pashto: عكس العمل،اغيزه، مدافعه، |
 Portuguese: reacção |
 Romanian: reacţie, mod de a reacţio |
 Russian: реакция |
 Slovak: reakcia |
 Slovenian: odziv |
 Serbian: reakcija |
 Swedish: reaktion |
 Thai: การตอบสนอง |
 Turkish: tepki, reaksiyon |
 Taiwanese: 反應 |
 Ukrainian: реакція |
 Urdu: رد عمل |
 Vietnamese: sự phản ứng |
 Chinese: 反应 |
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Definitions of Reaction 
