What context can I use each word in?
Learn when and how to use these words with these examples!
millennia
Example
The Great Pyramids of Giza have stood for several millennia. [millennia: plural noun]
Example
It takes millennia for geological changes to occur. [millennia: plural noun]
millennium
Example
The year 2000 marked the beginning of a new millennium. [millennium: singular noun]
Example
The fall of the Roman Empire marked the end of the first millennium. [millennium: singular noun]
Good things to know
Which word is more common?
Millennium is more commonly used than millennia in everyday language. Millennium is a well-known term that is often used in popular culture, while millennia is less common and more specialized.
What’s the difference in the tone of formality between millennia and millennium?
Both millennia and millennium are formal words that are appropriate for academic or professional writing. However, millennia may be perceived as more technical or scientific due to its frequent use in geological or historical contexts.
