Definition of Longevity

Babylon English Dictionary
long life; length of life
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Longevity Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
Long duration of life; length of life.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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longevity
\lon*gev"i*ty\ (?), n. [l. longaevitas. see longevous.] long duration of life; length of life. the instances of longevity are chiefly amongst the abstemious.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
Unusually prolonged life.
JM Welsh <=> English Dictionary
Hirhoedl = n. longevity
The Devil's Dictionary
Longevity, (n.)

Uncommon extension of the fear of death.
  
The Devil's Dictionary, by Ambrose Bierce, 1911 (About)
WordNet 2.0

Noun
1. duration of service; "her longevity as a star"; "had unusual longevity in the company"
(synonym) length of service
(hypernym) longness
2. the property of being long-lived
(synonym) seniority
(hypernym) oldness
Longevity Definition from Social Science Dictionaries & Glossaries
Glossary of Sociology
A long duration of life. Or, a long tenure in an organization.
Longevity Definition from Science & Technology Dictionaries & Glossaries
Fishery Glossary
Average maximum age in a cohort, or a stock, or a population. Lifespan is inversely proportional to natural mortality. Often referred to as Tmax in stock assessment models. See: Longevity
FAO
Longevity Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The word "longevity" is sometimes used as a synonym for "life expectancy" in demography - especially when it concerns someone or something lasting longer than expected (an ancient tree, for example) - however, the two words have slightly different definitions. In a similar dichotomy to "precision" and "accuracy", "longevity" refers to the average number of years that a single person lives, whereas "life expectancy" refers to the number of years that the average population lives. This is illustrated by the fact that a drastic increase in life expectancy (due to a larger portion of the population beginning to live longer) may be accompanied by a small increase in the overall longevity of the population.

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Longevity Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
difan'es (lifespan); wu'nil'es (lasting)
Longevity Definition from Medicine Dictionaries & Glossaries
Dictionary of Medicine (Shahram)
Lifespan. (With increasing longevity, women will soon be postmenopausal for one third of their lives).