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1. Dictionary

   Re·ac·tion

   /rēˈakSH(ə)n/

   

   noun

   • 1. an action performed or a feeling experienced in response to a situation or event: "Carrie's immediate reaction was one of relief" Similar responseanswerreplyrejoinderretortripostefeedbackinformal:comebackclapback
   • ▪ a person's ability to respond physically and mentally to external stimuli: "a skilled driver with quick reactions"
   • ▪ an adverse physiological response to a substance that has been breathed in, ingested, or touched: "such allergic reactions as hay fever and asthma"
   • ▪ a chemical process in which two or more substances act mutually on each other and are changed into different substances, or one substance changes into two or more other substances.
   • ▪ an analogous transformation of atomic nuclei or other particles.
   • ▪ a mode of thinking or behaving that is deliberately different from previous modes of thought and behavior: "the work of these painters was a reaction against fauvism" Similar backlashcounteractionrecoil
   • ▪ opposition to political or social progress or reform: "the institution is under threat from the forces of reaction" Similar conservatismultra-conservatismthe rightthe right wingthe extreme rightcounter-revolutionrevanchism
   • ▪ repulsion or resistance exerted in opposition to the impact or pressure of another body; a force equal and opposite to the force giving rise to it.

   Word Origin late 16th century: from re- + action, originally suggested by medieval Latin reactio(n-), from react- ‘done again’ (see react).

   Derivatives

   • 1. reactionist noun

   Scrabble Points: 10

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2. www.oxfordlearnersdictionaries.com › reactionreaction noun - Definition, pictures, pronunciation and usage ...

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   Definition of reaction noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

3. www.oxfordlearnersdictionaries.com › reactionreaction noun - Definition, pictures, pronunciation and usage ...

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   Definition of reaction noun from the Oxford Advanced Learner's Dictionary. reaction. noun. OPAL W OPAL S. /riˈækʃn/ to event/situation. [countable, uncountable] what you do, say or think as a result of something that has happened. to provoke/cause/get a reaction. a positive/negative/adverse reaction.

4. dictionary.cambridge.org › reactionREACTION | definition in the Cambridge Learner’s Dictionary

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   reaction noun (SUBSTANCES) a change that happens when two substances are put together: a chemical reaction. See also. chain reaction. (Definition of reaction from the Cambridge Learner's Dictionary © Cambridge University Press)

5. People also ask

   What is considered a reaction?

   • A reaction may be classified as redox in which oxidation and reduction occur or nonredox in which there is no oxidation and reduction occurring. Most simple redox reactions may be classified as combination, decomposition, or single displacement reactions.

   chemical reaction | Definition, Equations, Examples, & Types | Britannica

   www.britannica.com/science/chemical-reaction

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   What does reaction mean in science?

   • What does physical reaction mean? A physical reaction occurs when molecules undergo a molecular rearrangement to produce a physical change. So, the difference is that with a physical reaction, a chemical change in the molecule is not observed, but a physical change is observed.

   What does reaction mean in the science term? - Quora

   www.quora.com/What-does-reaction-mean-in-the-science-term

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   What is the meaning of reaction?

   • In psychology, reaction formation is a defense mechanism in which a person unconsciously replaces an unwanted or anxiety-provoking impulse with its opposite, often expressed in an exaggerated or showy way. A classic example is a young boy who bullies a young girl because, on a subconscious level, he's attracted to her.

   Reaction Definition in Chemistry - ThoughtCo

   www.verywellmind.com/reaction-formation-is-5190404

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6. www.dictionary.com › browse › reactionsREACTION Definition & Meaning | Dictionary.com

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   See synonyms for reaction on Thesaurus.com. noun. a reverse movement or tendency; an action in a reverse direction or manner. movement in the direction of political conservatism or extreme rightism. action in response to some influence, event, etc.: the nation's reaction to the president's speech.

7. www.britannica.com › dictionary › reactionReaction Definition & Meaning | Britannica Dictionary

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   Britannica Dictionary definition of REACTION. 1. : the way someone acts or feels in response to something that happens, is said, etc. [count] Their reaction to the news was positive. When I told him what happened, his immediate reaction was one of shock. The announcement produced an angry/stunned reaction from most of the people at the meeting.

8. www.ldoceonline.com › dictionary › reactionreaction | meaning of reaction in Longman Dictionary of ...

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   reaction meaning, definition, what is reaction: something that you feel or do because of...: Learn more.

9. www.merriam-webster.com › dictionary › reactionsReactions Definition & Meaning - Merriam-Webster

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   noun. re· ac· tion rē-ˈak-shən. Synonyms of reaction. 1. a. : the act or process or an instance of reacting. b. : resistance or opposition to a force, influence, or movement. especially : tendency toward a former and usually outmoded political or social order or policy. 2. : a response to some treatment, situation, or stimulus.