Noun

• S: (n) chemical reaction, reaction ((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"
• S: (n) reaction (an idea evoked by some experience) "his reaction to the news was to start planning what to do"
• S: (n) reaction, response (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"
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) reaction ((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"
• S: (n) reaction (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"
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) reaction (extreme conservatism in political or social matters) "the forces of reaction carried the election"
• S: (n) reaction (doing something in opposition to another way of doing it that you don't like) "his style of painting was a reaction against cubism"