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1 : the time required for half of something to undergo a process: as a : the time required for half of the atoms of a radioactive substance to become [disintegrated] b : the time required for half the amount of a substance (as a drug or radioactive tracer) in or introduced into a living system or ecosystem to be eliminated or [disintegrated] by natural processes 2 : a period of usefulness or [popularity] preceding decline or obsolescence <slang usually has a short half-life>
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