Definition of eldest adjective from the Oxford Advanced Learner's Dictionary

     

    eldest

     adjective
    adjective
    BrE BrE//ˈeldɪst//
     
    ; NAmE NAmE//ˈeldɪst//
     
     
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  1. 1(of people, especially of three or more members of the same family) oldest Tom is my eldest son.
  2. 2the eldest used without a noun immediately after it to show who is the oldest of three or more people the eldest of their three children Synonymsoldelderly aged long-lived matureThese words all describe somebody/​something that has lived for a long time or that usually lives for a long time.old having lived for a long time; no longer young:She’s getting old—she’s 75 next year.elderly (rather formal) used as a polite word for ‘old’:She is very busy caring for two elderly relatives.aged (formal) very old:Having aged relatives to stay in your house can be quite stressful.long-lived having a long life; lasting for a long time:Everyone in my family is exceptionally long-lived.mature used as a polite or humorous way of saying that somebody is no longer young:clothes for the mature womanPatterns a(n) old/​elderly/​aged/​long-lived/​mature man/​woman a(n) old/​elderly/​aged/​mature gentleman/​lady/​couple
  3. Word Origin Old English ieldest, eldest, of Germanic origin; related to German ältest, also to old.
See the Oxford Advanced American Dictionary entry: eldest