We found one dictionary that defines the word eleventh grades:

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1. eleventh grades: Wiktionary

▸ Words similar to eleventh grades ▸ Usage examples for eleventh grades ▸ Idioms related to eleventh grades ▸ Wikipedia articles (New!) ▸ Words that often appear near eleventh grades ▸ Rhymes of eleventh grades ▸ Invented words related to eleventh grades