reaction
/ɹiˈækʃən/ noun
Forms reactions
- noun An action or statement in response to a stimulus or other event. “The announcement of the verdict brought a violent reaction.”
- noun (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.”
- noun (politics) Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
- noun (Misesian praxeology, Austrian economics) Unpurposeful behavior.
- noun (Internet) An icon or emoji appended to a posted message by a user to express their feeling about it.
Synonyms
reax rxn chemical reaction response
Etymology
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.
The diaeresis emphasizes the pronunciation of the word with three rather than two syllables.
Webster’s 1913
- noun Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action.
- noun The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame.
Etymology [Cf. F. réaction.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “reaction”, CC BY-SA 4.0. Details