Webster's English Dictionary

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longevity

lon.gev.i.ty \la:n-'jev-*t-e-, lo.n-\ n [LL longaevitas, fr. L longaevus 
   long-lived, fr. longus long]+ aevum age - more at AYE 1a: a long duration 
   of individual life  1b: length of life  2: long continuance : SENIORITY