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longevity

[lon-jev-i-tee, lawn-]
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noun
  1. a long individual life; great duration of individual life: Our family is known for its longevity.
  2. the length or duration of life: research in human longevity.
  3. length of service, tenure, etc.; seniority: promotions based on longevity.
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Origin of longevity

From the Latin word longaevitās, dating back to 1605–15. See longevous, -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for longevity

longevity

noun
  1. long life
  2. relatively long duration of employment, service, etc
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Derived Formslongevous (lɒnˈdʒiːvəs), adjective

Word Origin

C17: from Late Latin longaevitās, from Latin longaevus long-lived, from longus long 1 + aevum age
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 longevity

n.

1610s, from Late Latin longaevitatem (nominative longaevitas) "great age, long life," from Latin longaevus "long-lived," from longus (see long (adj.)) + aevum "lifetime, age" (see eon).

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Online Etymology Dictionary, © 2010 Douglas Harper

longevity in Medicine

longevity

(lŏn-jĕvĭ-tē)
n.
  1. Duration of an individual life beyond the norm for the species.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.