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mean life

noun

Physics.
  1. the average time that an unstable particle or nucleus survives before it decays.


mean life

noun

  1. physics the average time of existence of an unstable or reactive entity, such as a nucleus, elementary particle, charge carrier, etc; lifetime. It is equal to the half-life divided by 0.693 15 τ
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Example Sentences

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"He killed my son. Life should mean life, however I understand the judicial system, and there has to be a tariff set in place," she said.

From

During natural disasters and extreme weather, employers’ choices can sometimes mean life or death, said David Michaels, a professor at the Milken Institute School of Public Health and a former assistant secretary of labor for the Occupational Safety and Health Administration.

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“That is hugely significant, because if that happens twice in our solar system, it could mean life is really common,” he says.

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Collins said she was appalled to see online trolling from "armchair admirals, people who will never have to make decisions which mean life or death for their subordinates".

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In a 1980 interview, a 34-year-old Trump describes politics as "a very mean life" and says "the most capable people" instead choose the business world.

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