# reaction
## English
### Alternative forms

* reäction (rare)

### 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.

### Pronunciation

* Audio (US):(file)
* IPA: /ɹiˈækʃən/
* Rhymes: -ækʃən

### Noun

reaction (plural reactions)
* 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?
    When I last tried to eat strawberries I had a terrible allergic reaction.
* (chemistry) 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.
* (politics) Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
* (Misesian praxeology, Austrian economics) Unpurposeful behavior.
* (Internet) An icon or emoji appended to a posted message by a user to express their feeling about it.

#### Synonyms

* reax (journalism jargon)
* rxn (abbreviation)

#### Derived terms

* Abderhalden reaction
* addition reaction
* alarm reaction
* alcohol flush reaction
* Appel reaction
* Arbuzov reaction
* Arndt-Eistert reaction
* Arthus reaction
* Asinger reaction
* Bamford-Stevens reaction
* Barton reaction
* Barton-Zard reaction
* Baylis-Hillman reaction
* Belousov-Zhabotinsky reaction
* 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
* 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
* Grignard reaction
* gut reaction
* half-reaction
* haloform reaction
* heat of reaction
* Heck reaction
* Horner-Wadsworth-Emmons reaction
* Horner-Wittig reaction
* hunting reaction
* HWE reaction
* idiosyncratic reaction
* id reaction
* immune reaction
* in reaction
* insertion reaction
* Jarisch-Herxheimer reaction
* Knoevenagel reaction
* Kolbe reaction
* Kolbe-Schmitt reaction
* Kulinkovich reaction
* Lewis reaction
* Maillard reaction
* Mannich reaction
* Mazzotti reaction
* McCormack reaction
* Meerwein-Ponndorf reaction
* Michaelis-Arbuzov reaction
* Michael reaction
* Mitsunobu reaction
* mixed reaction
* mixed reactions
* Molisch reaction
* name reaction
* Norrish reaction
* nuclear reaction
* oscillatory reaction
* overreaction
* paradoxical rage reaction
* pericyclic reaction
* photochemical reaction
* photonuclear reaction
* polymerase chain reaction
* precipitation reaction
* Prevost reaction
* problem-reaction-solution
* protective reaction
* reaction control system
* reaction engine
* reaction GIF
* reaction image
* reaction mass
* reaction mechanism
* reaction mixture
* reaction rate constant
* reaction save
* reaction time
* reaction turbine
* reaction vessel
* reaction wheel
* reaction wood
* rearrangement reaction
* redox reaction
* Reformatsky reaction
* Reimer-Tiemann reaction
* Ritter reaction
* Sandmeyer reaction
* Schmidt reaction
* sequential reaction
* Simmons-Smith reaction
* SN1 reaction
* SN2 reaction
* Sonogashira reaction
* Stetter reaction
* Stille reaction
* substitution reaction
* Suzuki reaction
* thermite reaction
* Tsuji-Trost reaction
* Weiss-Cook reaction
* Wharton reaction
* Wittig reaction
* Wohl-Ziegler reaction
* Wulff-Dötz reaction
* Wurtz reaction
* Zincke reaction
* Zincke-Suhl reaction

#### Related terms

* react
* reactant
* reactionary
* reactor
* reactional

#### Translations
### Anagrams

* actioner, actorine, anoretic, anticore, creation

## Interlingua
### Noun

reaction (plural reactiones)
* reaction

#### Related terms

* reactor
* reager