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"
• 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"
• domain category
• S: (n) mechanics (the branch of physics concerned with the motion of bodies in a frame of reference)
• direct hypernym / inherited hypernym / sister term
• S: (n) force ((physics) the influence that produces a change in a physical quantity) "force equals mass times acceleration"
• S: (n) physical phenomenon (a natural phenomenon involving the physical properties of matter and energy)
• S: (n) natural phenomenon (all phenomena that are not artificial)
• S: (n) phenomenon (any state or process known through the senses rather than by intuition or reasoning)
• S: (n) process, physical process (a sustained phenomenon or one marked by gradual changes through a series of states) "events now in process"; "the process of calcification begins later for boys than for girls"
• S: (n) physical entity (an entity that has physical existence)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• 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"
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• S: (n) resistance, opposition (the action of opposing something that you disapprove or disagree with) "he encountered a general feeling of resistance from many citizens"; "despite opposition from the newspapers he went ahead"