How many millennium in 1 decade? The answer is 0.01. We assume you are converting between millennium and decade. You can view more details on each measurement unit: millennium or decade The SI base unit for time is the second. 1 second is equal to 3.1709791983765E-11 millennium, or 3.1709791983765E-9 decade. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millennia and decades. Type in your own numbers in the form to convert the units!

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## Definition: Millennium

A millennium is a period of time equal to one thousand years. There are two main viewpoints about naming millennia and there was a popular debate leading up to the celebrations of the year 2000 as to whether 2000 was the beginning of a new millennium. Historically, there has been debate around the turn of the millennium, centuries and decades before.