noun
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a response to an action; reaction.
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the effect of an action.
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an act done countering or opposing another action.
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an answer or explanation given to or opposing a querry, objection, etc.; a rejoinder.
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(med.) a reaction - a) an action induced by resistance to another action, b) the effect produced by an allergen, c) a depression or exhaustion of energy following nervous tension, over-stimulation, etc., d) an increased activity following depression.
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(psych. & physol.) an organic response to a stimulus; a reaction.