Reaction

A reaction is usually any response caused by some other action:

Chain
Chemical
Emotional
Hill
Light
Nuclear
Physical reaction - Defined by Newton's third law: "For every action there is an equal and opposite reaction". The idea that any given force has a pair or opposite force.
Reflexive
Political - The reaction is the attitude of the reactionaries, or their political movement
Risk management - The reaction is a response after the hazard. Prevention is a response before the hazard materialization.
see also Adverse drug reaction

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