reaction

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See also: réaction and reäction

English

Alternative forms

Etymology

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(key): /ɹiˈækʃən/
  • Rhymes: -ækʃən

Noun

reaction (plural reactions)

  1. 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.
  2. (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.
  3. (politics) Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
  4. (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

Related terms

Translations

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Interlingua

Noun

reaction (plural reactiones)

  1. reaction

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