🇬🇧 en fi 🇫🇮

half-life noun

  /ˈhæfˌlaɪf/
  • (nuclear physics) The time required for half the nuclei in a sample of an isotope to undergo radioactive decay.
  • (physical chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
  • (medicine, pharmacology) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
  • The amount of time it takes for an idea or a fashion to lose half of its influential power.
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