reaction
noun/ɹiˈækʃən/
Etymology Inherited from Middle English reaccion, from Old French reaction, from Latin reāctiō, from the verb reagō, from re- (“again”) + agō (“to act”); more at re-, action; equivalent to react + -ion.
1
An action or statement in response to a stimulus or other event.
- The announcement of the verdict brought a violent reaction.
- You were in the courtroom. What is your reaction?
1 more example
- When I last tried to eat strawberries I had a terrible allergic reaction.
2
Chemistry, Natural sciences, Physical sciences A transformation in which one or more substances is converted into another by combination or decomposition.
- In this reaction, the acid and base will neutralize each other, producing a salt.
3
Government, Politics Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
- And as Europe advanced year by year more deeply into the low featureless plains of reaction, censorship and mediocrity and the pestilential swamps of poverty, unhappiness and oppression, the image of the liberating revolution became ever more luminous.1962, Eric Hobsbawm, The Age of Revolution. 1789-1848, page 268:
4
Economics, Sciences Austrian Unpurposeful behavior.
5
Internet An icon or emoji appended to a posted message by a user to express their feeling about it.
- Synonyms
- reax, rxn
- Derived terms
164 terms
Abderhalden reaction, addition reaction, alarm reaction, alcohol flush reaction, alloreaction, Appel reaction, Arbuzov reaction, Arndt-Eistert reaction, Arthus reaction, Asinger reaction, autoreaction, backreaction, Bamford-Stevens reaction, Barton reaction, Barton-Zard reaction, Baylis-Hillman reaction, Belousov-Zhabotinsky reaction, bioreaction, Boudouard reaction, Briggs-Rauscher reaction, Bucherer reaction, Bunsen reaction, BZ reaction, Cannizzaro reaction, chain reaction, chemical reaction, click reaction, combat stress reaction, condensation reaction, cortical reaction, counterreaction, crossreaction, Curtius reaction, cytotoxic reaction, Darzens reaction, dehydration reaction, diazo reaction, Dieckmann reaction, Diels-Alder reaction, dissociation reaction, Dötz reaction, double-replacement reaction, double replacement reaction, electron transfer reaction, elimination reaction, Étard reaction, Feulgen reaction, Finkelstein reaction, Friedel-Crafts reaction, Gould-Jacobs reaction, gravireaction, Grignard reaction, gut reaction, half-reaction, haloform reaction, heat of reaction, Heck reaction, Horner-Wadsworth-Emmons reaction, Horner-Wittig reaction, hunting reaction, HWE reaction, hyperreaction, idiosyncratic reaction, id reaction, immune reaction, immunoreaction, in reaction, insertion reaction, interreaction, Janovski reaction, Jarisch-Herxheimer reaction, knee-jerk reaction, Knoevenagel reaction, Kolbe reaction, Kolbe-Schmitt reaction, Kulinkovich reaction, Lewis reaction, macroreaction, Maillard reaction, Mannich reaction, Mazzotti reaction, McCormack reaction, Meerwein-Ponndorf reaction, Michaelis-Arbuzov reaction, Michael reaction, microreaction, misreaction, Mitsunobu reaction, mixed reaction, mixed reactions, Molisch reaction, multireaction, name reaction, neoreaction, nonreaction, Norrish reaction, nuclear reaction, oscillatory reaction, overreaction, paradoxical rage reaction, pericyclic reaction, photochemical reaction, photonuclear reaction, photoreaction, polymerase chain reaction, polyreaction, postreaction, precipitation reaction, Prevost reaction, problem-reaction-solution, protective reaction, pseudoreaction, reaction control system, reaction drive, reaction engine, reaction GIF, reaction image, reactionism, reactionist, reactionless, reaction mass, reaction mechanism, reaction mixture, reaction rate constant, reaction save, reaction time, reaction turbine, reaction vessel, reactionware, reaction wheel, reactionwise, reaction wood, rearrangement reaction, redox reaction, Reformatsky reaction, Reimer-Tiemann reaction, Ritter reaction, Sandmeyer reaction, Schmidt reaction, sequential reaction, seroreaction, Simmons-Smith reaction, SN1 reaction, SN2 reaction, Sonogashira reaction, Stetter reaction, Stille reaction, subreaction, substitution reaction, Suzuki reaction, thermite reaction, triboreaction, Tsuji-Trost reaction, underreaction, Weiss-Cook reaction, Wharton reaction, Wittig reaction, Wohl-Ziegler reaction, Wulff-Dötz reaction, Wurtz reaction, xenoreaction, Zimmermann reaction, Zincke reaction, Zincke-Suhl reaction- Related terms
- react, reactant, reactionary, reactor, reactional