Meaning of “O level” in the English Dictionary

british dictionary

"O level" in British English

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O levelnoun [ C ]

uk /ˈəʊ ˌlev.əl/ us /ˈoʊ ˌlev.əl/

a public exam in a particular subject that was taken in the past in British schools by some children aged 15 or 16, or the qualification from this:

She's got ten O levels.
O levels were replaced by GCSEs in 1988.

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