the average time that an unstable particle or nucleus survives before it decays.
- Also called average life, lifetime.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use mean life in a sentence
You are wasting precious moments that may mean life or death to the one we both love.Jolly Sally Pendleton | Laura Jean Libbey
It was hard to foresee the critical stress that should mean life or death to the ship and its people.The Cup of Fury | Rupert Hughes
The ingenious M. Muret, again, had found a Swiss parish in which the mean life was the highest and the fecundity smallest known.The English Utilitarians, Volume II (of 3) | Leslie Stephen
I kind of feel the life the boys live around these forests is a pretty mean life.The Man in the Twilight | Ridgwell Cullum
It was one of those friendly things, between friends, which might easily mean life or death.The Man in the Twilight | Ridgwell Cullum
British Dictionary definitions for mean life
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: Symbol: 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