English Explanatory Dictionary

reaction

English dictionary entry

Meanings

noun
  1. An action or statement in response to a stimulus or other event.
  2. A transformation in which one or more substances is converted into another by combination or decomposition.
  3. Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
  4. Unpurposeful behavior.
  5. An icon or emoji appended to a posted message by a user to express their feeling about it.

Pronunciation

en-us-reaction.ogg /ɹiˈækʃən/

Word forms

reaction reactions reäction

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.

Synonyms

reax rxn

Related words

react reactant reactionary reactor reactional

Derived words

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 Diels-Alder reaction dissociation reaction Dötz reaction double-replacement reaction double replacement reaction electron transfer reaction elimination reaction Étard 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
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