decay time

American

noun

Physics.

the time required for a collection of atoms of a particular radionuclide to decay to a fraction of the initial number equal to 1/e, where e = 2.7182818 …, used as the base of natural logarithms.

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decay time

If the GUT approach is right, the average decay time in question is far longer than the age of the universe itself.

From Economist ● Jan. 11, 2018

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023