What is Century ?
Century is (noun) 1. one hundred years the seventeenth century the period from 1600 to 1699 a 17th-century church The church dates from the 17th century. 2. a score of 100, especially in cricket He’s a powerful hitter and rapidly scored a century. He scored a century, including four fours and two sixes. (NOTE: The plural is centuries. The number of a century is always one more than the date number, so the period from 1900 to 1999 is the 20th century, and the period starting in the year 2000 is the 21st century.)
source: Easier English, Student Dictionary Upper Intermediate Level