100 years
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There are 100 years in a century. A century is defined as 100 consecutive years. When you say the 1900s, you mean the 100 years that start with in 1900. The 1990s is a decade.
There are 100 years in a century. There are 1000 years in a millennium.
A century is 100 years.
A century is one hundred years.
There were 100 years in the 20th century.