We found one dictionary that defines the word 3rd millennium:

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1. The 3rd Millennium, 3rd millennium: Wikipedia, the Free Encyclopedia

Phrases: 3rd millennium BC, more... ▸ Words similar to 3rd millennium ▸ Usage examples for 3rd millennium ▸ Idioms related to 3rd millennium ▸ Wikipedia articles (New!) ▸ Words that often appear near 3rd millennium ▸ Rhymes of 3rd millennium ▸ Invented words related to 3rd millennium