noun
the time required for half the amount of a substance to be eliminated or disintegrate
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The half life of a radioactive substance is the time taken for half of its atoms to decay.
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I heard that the half life of that medication is only a few hours.
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Dude, the half life of that energy drink is like, 10 minutes tops.
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The half life of a trend on social media is getting shorter and shorter these days.