There is no year 0 in the calendar we follow. 1 BC moves directly into 1AD. The first decade was AD 1-10. The second, AD 11-20.
We will begin to celebrate the next decade on January 1, 2011.
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In 2010. To prove it, look at the eighties: 1980-1989. So the second decade of the twenty-first century is from 2010-2019.
Just perhaps: era, epoch, eon but those are less numerically inclined
10 years is called a decade hence it is only a decade not decade of years
one decade is 10 years, one decade is 3650 days
A decade is 10 years. Since there are 12 months in a year, a decade will have 120 months.