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Related to O grade: Ordinary Grade
(formerly, in Scotland) nAlso called: Ordinary grade
a. the basic level of the Scottish Certificate of Education, now replaced by Standard Grade
b. (as modifier): O grade history.
2. (Education) a pass in a particular subject at O grade: she has ten O grades.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014