Meaning of “eldest” in the English Dictionary

"eldest" in British English

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eldestadjective [ before noun ]

uk /ˈel.dɪst/ us /ˈel.dɪst/

eldestnoun [ S ]

uk /ˈel.dɪst/ us /ˈel.dɪst/

(Definition of “eldest” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"eldest" in American English

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eldestadjective [ not gradable ]

us /ˈel·dəst/

oldest (of three or more people, esp. within a family):

He’s my eldest brother.

(Definition of “eldest” from the Cambridge Academic Content Dictionary © Cambridge University Press)