the longest period over which the life of any organism or species may extend, according to the available biological knowledge concerning it.
the longevity of an individual.
Origin of life span
First recorded in 1915–20
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for life span
Historical Examples of life span
He acquired all sorts of magic powers by means of which he extended his life-span.
As to the life-span itself there is reason to suppose that it is meant to be more regular than man allows it to become.
That's where the men astern would find use for the life-span.
Now, of course, shortened working hours and medical advances have equalized the life-span.
British Dictionary definitions for life span
the period of time during which a human being, animal, machine, etc, may be expected to live or function under normal conditions
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
The average or maximum length of time an organism, a material, or an object can be expected to survive or last.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.