| Definitions | noun - (physics) The time required for half of the nucleus, nuclei in a sample of a specific isotope to undergo radioactive decay.
- (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 pharmacologic, physiologic, or radiologic activity. Year introduced in w:MeSH: 1974(1971)
- (culture) The time it takes for an idea or a fashion to lose half of its influential power. "Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference" (Robert Ackerman, 1991. Introduction to Jane Ellen Harrison's Prolegomena to the Study of Greek Religion (1903).)
Translations: - Dutch: halfwaardetijd, halveringstijd
- French: demi-vie f
- German: Halbwertszeit f
- Italian: emivita , semivita , tempo di dimezzamento (1,2,3)
- Spanish: periodo de semidesintegración m; semivida f; hemivida f; vida mitad f
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