| NOUN | time | half life, half-life | 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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| Meaning | 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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| Synonym | half-life | |
| Broader | time period, period of time, period | An amount of time |
| Spanish | periodo de semidesintegración, semivida | |
| Catalan | període de semidesintegració, semivida | |
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