Just perhaps:
era, epoch, eon
but those are less numerically inclined
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there are 12,ooo months in a millenium. decade = 10 years Century= 100 years Millenium= 1000 years
A millenium is bigger than century
1000 years is called a millenium.
Some common units of time are the year, decade, century, millenium, month, week, day, hour, minute, second, millisecond, microsecond, nanosecond...
1865 is in the seventh decade of the 19th century.