Noun
- plural form of letter grade
letter-grades
English Wiktionary. Available under CC-BY-SA license.
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"letter-grades." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/letter-grades>.
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letter-grades. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/letter-grades
