What does half-life mean?

Looking for the meaning or definition of the word half-life? Here's what it means.

Noun (physics) The time required for half of the 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 pharmacological, physiologic, or radiological activity. The time it takes for an idea or a fashion to lose half of its influential power. Find more words! 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In addition, the plants would produce 7,313 tonnes of highly radioactive waste with a half-life of 24,000 years. For the recalcitrants, the hell-on-earth of daisy-cutters, thermobaric bombs and the everlasting half-life of the waste from nuclear detonations. Prealbumin, also known as transthyretin, has a half-life of only 1 to 2 days. At age 18, caffeine has a half-life of 4.5 hours, which increases with age. Decay of the semiquinone radical under argon occurs by second-order kinetics with a first half-life in the 0.1-2 ms range under our conditions. See Also Sentences with the word half-life Words that rhyme with half-life What is the plural of half-life? Nearby Definitions halflife half-landings half-landing half-Jews half-Jew half-jackets half-light half-line half-lines halfling halflings half lit