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life span

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for lifespan
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Historical Examples
  • And what the hell, the doctors are increasing our lifespan every day with new drugs and things, aren't they?

    The Slizzers Jerome Bixby
British Dictionary definitions for lifespan

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
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Word Origin and History for lifespan

also life span, 1918, from life (n.) + span (n.1).

Online Etymology Dictionary, © 2010 Douglas Harper
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lifespan in Medicine

life span n.

  1. A lifetime.

  2. 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.
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