Noun
- plural form of ninth grade
ninth-grades
English Wiktionary. Available under CC-BY-SA license.
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"ninth-grades." YourDictionary, n.d. Web. 11 December 2018. <https://www.yourdictionary.com/ninth-grades>.
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ninth-grades. (n.d.). Retrieved December 11th, 2018, from https://www.yourdictionary.com/ninth-grades
