Meaning of “only child” in the English Dictionary

british dictionary

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

"only child" in American English

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only childnoun [ C usually sing ]

us /ˈoʊn·li ˈtʃaɪld/

someone who has no sisters or brothers

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