Millennia in a Sentence 

Definition of Millennia  

plural of millennium, a period of a thousand years

Examples of Millennia in a sentence

The universe has existed for untold millennia, making it billions of years old.  
Only two millennia have passed since the induction of the BC and AD calendar.  
Humans have existed on Earth for several millennia, though certainly not in the same state as we are now.  

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