reaction.
An action or statement in response to a stimulus or other event.
Meaning & usage
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?
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.
Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
Unpurposeful behavior.
An icon or emoji appended to a posted message by a user to express their feeling about it.
Where this word comes from
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.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.