A Canadian historical term for the optional or compulsory 13th year of secondary school, which existed in Ontario until 2003. It served as a university preparatory year and was used for university entrance. Its elimination was controversial and it remains a cultural reference point for generations of Ontarians.
He stayed for grade thirteen to boost his average before applying to engineering.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(Canada, historical) Thirteenth grade.
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