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(chemistry) a process in which one or more substances are changed into others;
"there was a chemical reaction of the lime with the ground water"
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an idea evoked by some experience;
"his reaction to the news was to start planning what to do"
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a bodily process occurring due to the effect of some antecedent stimulus or agent;
"a bad reaction to the medicine"
"his responses have slowed with age"
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(mechanics) the equal and opposite force that is produced when any force is applied to a body;
"every action has an equal and opposite reaction"
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a response that reveals a person's feelings or attitude;
"he was pleased by the audience's reaction to his performance"
"John feared his mother's reaction when she saw the broken lamp"
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extreme conservatism in political or social matters;
"the forces of reaction carried the election"
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doing something in opposition to another way of doing it that you don't like;
"his style of painting was a reaction against cubism"