Half-life (noun) Definition, Meaning & Examples

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noun, plural half-lives [haf-lahyvz, hahf-]. /ˈhæfˌlaɪvz, ˈhɑf-/.
  1. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.
  2. the time required for the activity of a substance taken into the body to lose one half its initial effectiveness.
  3. a brief period during which something flourishes before dying out.
noun
  1. the time taken for half of the atoms in a radioactive material to undergo decay
  2. the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life) or removed by both elimination and decay (effective half-life)
    Half-life (noun) Definition, Meaning & Examples

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