A decade is a period of ten years, often used to describe specific time frames in history or culture, such as the 1980s. A century spans one hundred years, marking significant changes over longer periods, like the 20th century from 1901 to 2000. A millennium refers to a thousand years, and is often used to denote the transition from one thousand-year period to another, such as from the year 1999 to 2000. Each unit helps categorize and understand the passage of time in human history.
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decade:10 years century:100 years millennium:1000 years
years...or 10, 100,1000
triennium
A century is calculated by 100 years. A decade is 10 years. A millennium is 1000 years. A year is 12 months.
There are ten decades in a millennium. A decade is a period of ten years, and a millennium is a period of one thousand years. Therefore, a millennium consists of ten decades.