A reaction is usually any response caused by some other event:
The word Reaction may also refer to:
An adverse drug reaction (abbreviated ADR) or adverse drug event (abbreviated ADE) is an expression that describes the unwanted negative consequences A chemical reaction is a process that always results in the interconversion of Chemical substances The substance or substances initially involved in a chemical reaction are called The initial stage of the photosynthetic system is the light-dependent reaction, which converts solar energy into Potential energy. In Nuclear physics, a nuclear reaction is the process in which two nuclei or nuclear particles collide to produce products different from the initial particles In Classical mechanics, Newton's third law states that Forces occur in pairs one called the Action and the other the Reaction ( actio et A reflex action, also known as a reflex, is an involuntary and almost instant movement in response to stimulus. Reactionary (also reactionist) is a derogatory term usually used by the Left wing in regards to movements which oppose radical change in society and seeks a return Reaction Records was an "Independent" British Record label run by music executive Robert Stigwood in 1966 and 1967. ReAction GUI it is the name of the Widget toolkit engine that is used in AmigaOS 4© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
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