We found one dictionary that defines the word middle kingdoms:

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1. Middle Kingdoms: Collins English Dictionary

Phrases: Middle kingdoms of India, more... ▸ Words similar to middle kingdoms ▸ Usage examples for middle kingdoms ▸ Idioms related to middle kingdoms ▸ Wikipedia articles (New!) ▸ Words that often appear near middle kingdoms ▸ Rhymes of middle kingdoms ▸ Invented words related to middle kingdoms