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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.
Just perhaps: era, epoch, eon but those are less numerically inclined
A new decade signifies the beginning of a period of ten years in the calendar. It marks a fresh start, a new chapter, and the opportunity for change and growth. It is often seen as a time for reflection, goal-setting, and envisioning the future.
10 years is called a decade hence it is only a decade not decade of years
as we are now in the 21st Century, the decades start as 2010, 2020, 2030, 2040, 2050, 2060, 2070, 2080, 2090 and the 22nd Century will start as 2100