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life·spanalso life span (līf′spăn′)
1. A lifetime.
2. The average or maximum length of time an organism, material, or object can be expected to survive or last.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the longest period over which the life of any organism or species may extend.
2. the longevity of an individual.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.