lon·gev·i·ty

[lon-jev-i-tee, lawn-]
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.

Origin:
1605–15; < Latin longaevitās. See longevous, -ity

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
longevity (lɒnˈdʒɛvɪtɪ) [Click for IPA pronunciation guide]
 
n
1.  long life
2.  relatively long duration of employment, service, etc
 
[C17: from Late Latin longaevitās, from Latin longaevus long-lived, from longuslong1 + aevum age]
 
longevous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Longevity is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

longevity
1615, from L.L. longævitas "great age, long life," from L. longævus "long-lived," from longus "long" (adj.) + ævum "lifetime, age."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

longevity lon·gev·i·ty (lŏn-jěv'ĭ-tē)
n.
Duration of an individual life beyond the norm for the species.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The pharmaceutical industry has long believed that a pill to increase longevity
  would be the ultimate blockbuster drug.
Note also that the longevity of components is not nearly as long as western
  design and produced alternatives.
Here the units of life are depletion, longevity, and unremitting loneliness.
But she was popular for her guts, zest for life and sheer longevity.
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