English dictionary

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English noun: reaction

1. reaction (process) (chemistry) a process in which one or more substances are changed into others

SamplesThere was a chemical reaction of the lime with the ground water.

Synonymschemical reaction

Broader (hypernym)chemical action, chemical change, chemical process

Narrower (hyponym)addition reaction, aldol reaction, chain reaction, chemical decomposition reaction, chemical equilibrium, decomposition, decomposition reaction, displacement, displacement reaction, double decomposition, double decomposition reaction, elimination reaction, endothermic reaction, equilibrium, exothermic reaction, hydrolysis, metathesis, neutralisation, neutralisation reaction, neutralization, neutralization reaction, oxidation, oxidation-reduction, oxidisation, oxidization, oxidoreduction, photochemical reaction, redox, reducing, reduction, saponification

Domain categorychemical science, chemistry

2. reaction (cognition) an idea evoked by some experience

SamplesHis reaction to the news was to start planning what to do.

Broader (hypernym)idea, thought

3. reaction (act) a bodily process occurring due to the effect of some antecedent stimulus or agent

SamplesA bad reaction to the medicine.
His responses have slowed with age.


Broader (hypernym)activity, bodily function, bodily process, body process

Narrower (hyponym)answer, automatism, double take, electrical skin response, electrodermal response, Fere phenomenon, galvanic skin response, GSR, immune reaction, immune response, immunologic response, inborn reflex, innate reflex, instinctive reflex, kinesis, learned reaction, learned response, overreaction, passage, passing, physiological reaction, psychogalvanic response, rebound, reflex, reflex action, reflex response, Tarchanoff phenomenon, taxis, transfusion reaction, tropism, unconditioned reflex

4. reaction (phenomenon) (mechanics) the equal and opposite force that is produced when any force is applied to a body

SamplesEvery action has an equal and opposite reaction.

Broader (hypernym)force

Domain categorymechanics

5. reaction (phenomenon) a response that reveals a person's feelings or attitude

SamplesHe was pleased by the audience's reaction to his performance.
John feared his mother's reaction when she saw the broken lamp.

Broader (hypernym)response

6. reaction (cognition) extreme conservatism in political or social matters

SamplesThe forces of reaction carried the election.

Broader (hypernym)conservatism, conservativism

7. reaction (act) doing something in opposition to another way of doing it that you don't like

SamplesHis style of painting was a reaction against cubism.

Broader (hypernym)opposition, resistance

Narrower (hyponym)backlash

Based on WordNet 3.0 copyright © Princeton University.
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