American English

Definition of eldest adjective from the Oxford Advanced American Dictionary



    (old-fashioned or formal)
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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 Thesaurusoldelderly aged long-lived matureThese words all describe someone who or 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'll be 75 next year.elderly (somewhat formal) used as a polite word for “old”:He is very busy caring for two elderly relatives.aged (formal) very old:Having aged relatives visiting you 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 somene 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
See the Oxford Advanced Learner's Dictionary entry: eldest