half life
half·life
noun
1.
the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
2.
the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
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Broader terms
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.