|The Simple English Wiktionary has a definition for: reaction.|
A reaction might refer to:
- Chain reaction
- Chemical reaction, happens when one or more chemicals are changed into one or more other chemicals.
- Light reaction
- Nuclear reaction, a process involving an atomic nucleus or more than one nucleus.
- Reaction (physics) -From Newton's third law: "For every action there is an equal and opposite reaction". The idea that any one force has an opposite force.
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