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
• S: (n) automatism (any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy))
• S: (n) rebound (a reaction to a crisis or setback or frustration) "he is still on the rebound from his wife's death"
• S: (n) overreaction (an excessive reaction; a reaction with inappropriate emotional behavior)
• S: (n) galvanic skin response, GSR, psychogalvanic response, electrodermal response, electrical skin response, Fere phenomenon, Tarchanoff phenomenon (a change in the electrical properties of the skin in response to stress or anxiety; can be measured either by recording the electrical resistance of the skin or by recording weak currents generated by the body)
• S: (n) immune response, immune reaction, immunologic response (a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen)
• S: (n) tropism (an involuntary orienting response; positive or negative reaction to a stimulus source)
• S: (n) taxis (a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism)
• S: (n) kinesis (a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation)
• S: (n) double take (a delayed reaction indicating surprise)
• S: (n) reflex, reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction (an automatic instinctive unlearned reaction to a stimulus)
• S: (n) learned reaction, learned response (a reaction that has been acquired by learning)
• S: (n) passage, passing (a bodily reaction of changing from one place or stage to another) "the passage of air from the lungs"; "the passing of flatus"
• S: (n) answer (a nonverbal reaction) "his answer to any problem was to get drunk"; "their answer was to sue me"
• S: (n) transfusion reaction (reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death)
• direct hypernym / inherited hypernym / sister term
• S: (n) bodily process, body process, bodily function, activity (an organic process that takes place in the body) "respiratory activity"
• 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"
• 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