A century is one hundred years.
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There are 100 years in a century. There are 1000 years in a millennium.
A century is 100 years.
There were 100 years in the 20th century.
A century is 100 years One year = 1/100 century or 0.01 century
20 years is less than a century. A century is 100 years. So 20 years is one fifth of or 20% of a century.