reaction

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reaction /riˈækʃən/ noun
plural reactions
reaction
/riˈækʃən/
noun
plural reactions
Learner's definition of REACTION
: the way someone acts or feels in response to something that happens, is said, etc.
[count]
[noncount]
: an action or attitude that shows disagreement with or disapproval of someone or something
[count]
usually singular often + against
[noncount]
reactions [plural] : the ability to act and move quickly in order to avoid sudden danger
medical : an occurrence in which your body is affected by a drug, food, etc., in usually a bad way
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chemistry : a chemical change that occurs when two or more substances combine to form a new substance
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[count, noncount] physics : a process in which the nucleus of an atom is changed by being split apart or joined with the nucleus of another atom
called also nuclear reaction
see also chain reaction
[count, noncount] physics : a physical force that opposes the action of an equal and opposite force
[noncount] formal : a strong tendency or desire to oppose new political or social ideas
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