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Dictionary definition for: Reaction

1. (n) 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"

2. (n) a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine" "his responses have slowed with age"

3. (n) (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"

4. (n) an idea evoked by some experience; "his reaction to the news was to start planning what to do"

5. (n) doing something in opposition to another way of doing it that you don''t like; "his style of painting was a reaction against cubism"

6. (n) extreme conservatism in political or social matters; "the forces of reaction carried the election"

7. (n) (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"

WordNet 2.1 Copyright Princeton University. All rights reserved.