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Longevity Long Latin  From  Life Noun  Long Lon·Gev·I·Ty

Title longevity
Text
Merriam-Webster's Collegiate Dictionary
lon·gev·i·ty

 \\län-ˈje-və-tē, lȯn-\\ noun
 ETYMOLOGY  Late Latin longaevitas, from Latin longaevus long-lived, from longus long + aevum age — more at 
aye
 DATE  1615
1.
  a. a long duration of individual life
  b. length of life
      a study of longevity
2. long continuance : 
permanence
durability
English Etymology
longevity
  1615, from L.L. longævitas "great age, long life," from L.longævus "long-lived," from longus "long" (adj.) + ævum"lifetime, age."
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
longevity
lon·gev·ity lCn5dVevEtiNAmE lB:n-lC:n- / noun[U]
   (formal) long life; the fact of lasting a long time
   长寿;长命;持久:
   We wish you both health and longevity. 
   我们祝愿您俩健康长寿。 
   He prides himself on the longevity of the company. 
   他为公司悠久的历史而感到骄傲。 
Webster's Third New International Dictionary, Unabridged
lon·gev·i·ty
\länˈjevəd.ē, lȯn-, -ətē, -i\ noun
(-es)
Etymology: Late Latin longaevitas, from Latin longaevus long-lived (from longus long + aevum age, lifetime) + -itas -ity — more at 
long
aye
1. 
 a. : a long duration of individual life
  < his longevity was remarkable, considering the fact that he had been sickly as a child >
  longevity of metal parts is increased by this new process — Report: General Motors Corp. >
 b. : length of life
  < studies in longevity >
2. : long continuance : 
seniority
 longevity in office is also an asset — Spencer Parratt >
 < held a remarkable record for parliamentary longevity — Time >

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