We found one dictionary that defines the word eastern countries:

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1. Eastern countries: Encyclopedia

Phrases: Cooperation between China and Central and Eastern European Countries, more... ▸ Words similar to eastern countries ▸ Usage examples for eastern countries ▸ Idioms related to eastern countries ▸ Wikipedia articles (New!) ▸ Words that often appear near eastern countries ▸ Rhymes of eastern countries ▸ Invented words related to eastern countries