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[ree-ak-tiv-i-tee] /ˌri ækˈtɪv ɪ ti/

the quality or condition of being .
Chemistry. the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound.
Physics. a measure of the deviation from the condition at which a nuclear reactor is critical.
Immunology. the ability of an antigen to combine with an antibody.

reactivity re·ac·tiv·i·ty (rē’āk-tĭv’ĭ-tē)


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