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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 half-life /-ˌlaɪf/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 half-life /-ˌlaɪf/ 名詞

From: WordNet (r) 2.0

      n : 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) [syn: half life]