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life span

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noun
  1. the longest period over which the life of any organism or species may extend, according to the available biological knowledge concerning it.
  2. the longevity of an individual.
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Origin of life span

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lifespan

Contemporary Examples

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

noun
  1. the period of time during which a human being, animal, machine, etc, may be expected to live or function under normal conditions
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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

Word Origin and History for lifespan

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.