reaction

• reäction (rare)

Old French reaction, from Latin reāctiō, from the verb reagō, from re- (“again”) + agō (“to act”); more at re-, action; equivalent to react +‎ -ion.

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• IPA^(key): /ɹiˈækʃən/
• Rhymes: -ækʃən

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.

• reax (journalism jargon)
• rxn (abbreviation)

• Boudouard reaction
• Briggs-Rauscher reaction
• Finkelstein reaction
• overreaction
• reaction rate constant

• chain reaction
• mixed reactions
• react
• reactant
• reactionary
• reaction time
• reactor
• reactional

• actioner, actorine, anoretic, anticore, creation

reaction (plural reactiones)

1. reaction

• reactor
• reager