Definition of Half-life
Half-life
half·life
Definition/Meaning
(noun)
Time required for half of a substance to decay or disintegrate.
e.g. The half-life of radioactive uranium is approximately 4.5 billion years.
(noun)
the amount of time needed for half the amount of a substance such as a pesticide or drug in a natural system to be broken down or eliminated;
e.g. If a medicine has a short half-life, its effects will wear off relatively quickly.
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