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Word: half-life (lookup usage) (lookup stats)


Meaning:

Noun:

  • 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 The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
  • physics The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
  • The time it takes for an idea or a fashion to lose half of its influential power.

Source: Wiktionary | Src Info »