O lev‧el /ˈəʊ ˌlevəl $ ˈoʊ-/ noun [uncountable and countable]
(Ordinary level) an examination in a range of subjects, formerly done by students in schools in England and Wales, usually at the age of 15 or 16. In 1988, O levels were replaced by GCSEs. ⇒ GCSE, A Level

[TahlilGaran] Dictionary of Contemporary English ▲