Question

definition of nuclear reactor​

Answer 1

It is a closed chamber used in nuclear power plant so as to enable a controlled nuclear fission

Answer 2

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$\bold{\longmapsto}$Nuclear reactor, any of a class of devices that can initiate and control a self-sustaining series of nuclear fissions. Nuclear reactors are used as research tools, as systems for producing radioactive isotopes, and most prominently as energy sources for nuclear power plants.

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