Dictionary

reaction en · NOUN

Pronunciation

• (US) audio
• /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.

Meanings

1. An action or statement in response to a stimulus or other event.
   • When I last tried to eat strawberries I had a terrible allergic reaction.
   • You were in the courtroom. What is your reaction?
   • The announcement of the verdict brought a violent reaction.
2. 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. 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. (Austrian) Unpurposeful behavior.
5. (Internet) An icon or emoji appended to a posted message by a user to express their feeling about it.

Forms

Deriveds

Feulgen reaction · Michaelis-Arbuzov reaction · Arbuzov reaction · macroreaction · Skraup reaction · gut reaction · Heck reaction · Wulff-Dötz reaction · insertion reaction · Horner-Wadsworth-Emmons reaction · Horner-Wittig reaction · Sonogashira reaction · name reaction · backreaction · Curtius reaction · pericyclic reaction · interreaction · Stetter reaction · rearrangement reaction · Étard reaction · counterreaction · Schotten-Baumann reaction · paradoxical rage reaction · reaction control system · thermite reaction · crossreaction · reaction mass · Schmidt reaction · elimination reaction · haloform reaction · reactionwise · immune reaction · Zincke-Suhl reaction · Belousov-Zhabotinsky reaction · combat stress reaction · triboreaction · reactionism · gravireaction · reaction rate constant · dehydration reaction · Reimer-Tiemann reaction · Wittig reaction · Michael reaction · electron transfer reaction · Zimmermann reaction · photoreaction · reaction GIF · Dötz reaction · Barton-Zard reaction · hyperreaction · bioreaction · postreaction · Diels-Alder reaction · underreaction · multireaction · reactionless · mixed reactions · polyreaction · Gattermann reaction · id reaction · Kolbe reaction · Zincke reaction · chain reaction · reaction wood · cytotoxic reaction · redox reaction · Darzens reaction · Lewis reaction · Gould-Jacobs reaction · BZ reaction · Kolbe-Schmitt reaction · alcohol flush reaction · in reaction · Friedel-Crafts reaction · Briggs-Rauscher reaction · Wohl-Ziegler reaction · Dieckmann reaction · Bamford-Stevens reaction · condensation reaction · diazo reaction · oscillatory reaction · alarm reaction · precipitation reaction · Mitsunobu reaction · photochemical reaction · sequential reaction · misreaction · half-reaction · reactionware · Reformatsky reaction · Tsuji-Trost reaction · Mannich reaction · xenoreaction · neoreaction · reaction vessel · nuclear reaction · problem-reaction-solution · Finkelstein reaction · McCormack reaction · reaction wheel · Arndt-Eistert reaction · Appel reaction · protective reaction · dissociation reaction · Sandmeyer reaction · pseudoreaction · knee-jerk reaction · Stille reaction · Baylis-Hillman reaction · microreaction · cortical reaction · addition reaction · Meerwein-Ponndorf reaction · Mazzotti reaction · photonuclear reaction · alloreaction · HWE reaction · reaction time · double replacement reaction · Bunsen reaction · Grignard reaction · immunoreaction · reactionist · reaction save · Ritter reaction · Kulinkovich reaction · Asinger reaction · Janovski reaction · polymerase chain reaction · Prevost reaction · Bucherer reaction · Weiss-Cook reaction · reaction mixture · seroreaction · SN2 reaction · idiosyncratic reaction · nonreaction · Simmons-Smith reaction · substitution reaction · subreaction · Maillard reaction · reaction mechanism · hunting reaction · click reaction · reaction engine · autoreaction · reaction image · reaction turbine · Pfitzinger reaction · overreaction · heat of reaction · Jarisch-Herxheimer reaction · mixed reaction · Suzuki reaction · Wurtz reaction · SN1 reaction · Knoevenagel reaction · Wharton reaction · Boudouard reaction · Arthus reaction · double-replacement reaction · chemical reaction · Molisch reaction · Abderhalden reaction · Barton reaction · Cannizzaro reaction · reaction drive · Norrish reaction

Relateds

react · reactionary · reactional · reactant · reactor

Synonyms

rxn · reax

Translations (142)

he תְּגוּבָה (action in response to an event) · tr reaksiyon (action in response to an event) · tl balibilos (chemical transformation) · ms tindak balas (action in response to an event) · mr प्रतिक्रिया (action in response to an event) · gl reacción (action in response to an event) · mn урвал (action in response to an event) · uz reaksiya (action in response to an event) · is hvarf (chemical transformation) · tr tepkime (chemical transformation) · ko 반응 (chemical transformation) · fi taantumus (reactionary politics) · ar رَدّ فِعْل (action in response to an event) · be рэа́кцыя (chemical transformation) · ro reacție (chemical transformation) · kk реакция (chemical transformation) · nb reaksjon (chemical transformation) · fi reaktio (chemical transformation) · fa رآکسیون (action in response to an event) · uk реа́кція (action in response to an event) · hu reakció (reactionary politics) · mr अभिक्रिया (chemical transformation) · te ప్రతిచర్య (action in response to an event) · az irtica (reactionary politics) · km ប្រតិកម្ម (action in response to an event) · es reacción (action in response to an event) · bg реакционерство (reactionary politics) · ja 反応 (chemical transformation) · is hvörf (chemical transformation) · fi vaikutus (action in response to an event) · sh реа̀кција (action in response to an event) · ko 반응 (action in response to an event) · sh reàkcija (action in response to an event) · af reaksie (action in response to an event) · ka რეაქცია (chemical transformation) · da reaktion (action in response to an event) · ga frithghníomhaíocht (action in response to an event) · be рэа́кцыя (action in response to an event) · pl reakcja (action in response to an event) · nl reactie (action in response to an event) · az təpki (action in response to an event) · sl reakcija (action in response to an event) · ka რეაქცია (action in response to an event) · kk реакция (action in response to an event) · ru реа́кция (action in response to an event) · az əksüləməl (action in response to an event) · de Reaktion (chemical transformation) · bg реа́кция (action in response to an event) · nb reaksjon (action in response to an event) · tg таассур (action in response to an event) · ca reacció (chemical transformation) · cy adwaith (chemical transformation) · cmn 反動 /反动 (action in response to an event) · te చర్య (chemical transformation) · eo reakcio (action in response to an event) · it reazione (chemical transformation) · ja 反応 (action in response to an event) · th ปฏิกิริยา (action in response to an event) · hi प्रक्रिया (action in response to an event) · sa प्रक्रिया (action in response to an event) · ota تفاعل (action in response to an event) · hu reakció (action in response to an event) · id reaksi (action in response to an event) · el αντίδραση (chemical transformation) · ko 반동 (action in response to an event) · et reaktsioon (action in response to an event) · cy adwaith (action in response to an event) · hi प्रतिक्रिया (action in response to an event) · lo ປະຕິກິລິຍາ (action in response to an event) · te ప్రతిక్రియ (action in response to an event) · es reacción (chemical transformation) · hy ռեակցիա (chemical transformation) · cy ymateb (action in response to an event) · vi phản ứng (action in response to an event) · uk реа́кція (chemical transformation) · fr réaction (chemical transformation) · lb Reaktioun (action in response to an event) · ja 反動 (action in response to an event) · cmn 反應 /反应 (action in response to an event) · sk reakcia (action in response to an event) · mk реакција (action in response to an event) · hi रासायनिक अभिक्रिया (chemical transformation) · fa واکنش (action in response to an event) · lt reakcija (action in response to an event) · la reāctiō (action in response to an event) · sa प्रतिक्रिया (action in response to an event) · pt reação (chemical transformation) · az reaksiya (reactionary politics) · az reaksiya (action in response to an event) · ar تَفَاعُل (chemical transformation) · ja リアクション (action in response to an event) · ms tindak balas (chemical transformation) · ota عكسالعمل (action in response to an event) · fi reaktio (action in response to an event) · tg реаксия (action in response to an event) · pt reação (action in response to an event) · lb Reaktioun (chemical transformation) · cs reakce (chemical transformation) · de Reaktion (action in response to an event) · ko 리액션 (action in response to an event) · th ปฏิกิริยา (chemical transformation) · bn প্রতিক্রিয়া (action in response to an event) · rsk реакция (action in response to an event) · uz reaksiya (chemical transformation) · ro reacție (action in response to an event) · da reaktion (chemical transformation) · tl reaksyon (action in response to an event) · ga imoibriú (chemical transformation) · ms reaksi (action in response to an event) · ca reacció (action in response to an event) · ru реа́кция (chemical transformation) · tg вокуниш (action in response to an event) · mt reazzjoni (action in response to an event) · fi vastavaikutus (action in response to an event) · it reazione (action in response to an event) · uz sezish (action in response to an event) · tr tepki (action in response to an event) · sv reaktion (action in response to an event) · nn reaksjon (action in response to an event) · el αντίδραση (action in response to an event) · sw mmenyuko (action in response to an event) · nn reaksjon (chemical transformation) · lv reakcija (action in response to an event) · cmn 反應 /反应 (chemical transformation) · cs reakce (action in response to an event) · hy ռեակցիա (action in response to an event) · ar تَفَاعُل (action in response to an event) · sq reagim (action in response to an event) · cy ymateb (chemical transformation) · af reaksie (chemical transformation) · ms reaksi (chemical transformation) · vi phản ứng (chemical transformation) · hy փոխազդեցություն (chemical transformation) · tk reaksiýa (action in response to an event) · ky реакция (action in response to an event) · fi vaste (action in response to an event) · lo ປະຕິກິຣິຍາ (action in response to an event) · eo reago (action in response to an event) · mi tauhohenga (chemical transformation) · bg реа́кция (chemical transformation) · fr réaction (action in response to an event) · de Reaktion (reactionary politics)