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longevity

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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; < L longaevitās. See longevous, -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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lon·gev·i·ty   (lŏn-jěv'ĭ-tē, lôn-)   
n.   pl. lon·gev·i·ties
    1. Long life; great duration of life: His longevity vexed his heirs.

    2. Length or duration of life: comparing the longevities of the two peoples.

  1. Long duration or continuance, as in an occupation: had unusual longevity in the company; her longevity as a star.


[Late Latin longaevitās, from Latin longaevus, ancient : longus, long; see del-1 in Indo-European roots + aevum, age; see aiw- in Indo-European roots.]
lon·ge'vous (-jē'vəs) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: lon·gev·i·ty
Pronunciation: län-'jev-&t-E, lon-
Function: noun
Inflected Form: plural -ties
1 : a long duration of individual life longevity was remarkable considering the fact that he had been sickly as a child>
2 : length of life longevity>
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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