reaction

reaction (http://definr.com/reaction)

     n 1: 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: 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" [syn: response]
     3: (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" [syn: chemical reaction]
     4: an idea evoked by some experience; "his reaction to the news
        was to start planning what to do"
     5: 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: extreme conservatism in political or social matters; "the
        forces of reaction carried the election"
     7: (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"