WordReference Random House Unabridged Dictionary of American English © 2020
O lev•el   lev′əl),USA pronunciation [Brit.]
  1. British Terms, Educationa public examination for secondary-school students, usually 15 to 16 years old, testing basic knowledge in various subjects, required before advancing to more specialized courses of study.
  2. Education, British Termsa pass in this examination.
Cf.  A level. 
  • O(rdinary) level

Collins Concise English Dictionary © HarperCollins Publishers::
O level n (formerly, in Britain)
  1. the basic level of the General Certificate of Education, now replaced by GCSE
  2. (as modifier): O level maths
  3. a pass in a particular subject at O level: he has eight O levels

Systematic name: Ordinary level
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