thirteenth grade
Noun
Meaning
thirteenth grade (plural thirteenth grades)
(US, education) The year in school that comes after twelfth grade in some schools in the US, and that came after twelfth grade before 1988 in Ontario, Canada.
Noun
thirteenth grade (plural thirteenth grades)
(US, education) The year in school that comes after twelfth grade in some schools in the US, and that came after twelfth grade before 1988 in Ontario, Canada.