Substantiv
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| half-life -
The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
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| half-life -
In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
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| half-life -
The time it takes for a substance drug, radioactive nuclide, or other to lose half of its pharmacological, physiologic, or radiological activity.
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| half-life -
The time it takes for an idea or a fashion to lose half of its influential power.
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