Dictionary.com
Thesaurus.com

decay time

American  

noun

Physics.

  1. 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.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.