Definitions for half life
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Princeton's WordNet
half life, half-life(noun)
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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"half life." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/half life>.

