a noun is a person, place, thing, or idea. In the case of century, it can refer to a period of 100 years, starting from a year ending in 01 and ending with the year ending in 00. It can also be used to indicate a particular set of years that can be seen as distinct, such as the 19th century. The word century acts as a noun and is used when referring to a period of 100 years, beginning with a '01' year and ending with a '00' year. It can also be used to refer to a distinct period of years.
century is always spelled out when used in text, no abbreviations are allowed. The plural form of the word is centuries.When referring to a particular century, it is often preceded by two numerals (i.e. 19th century).
The 18th century saw a great scientific and industrial revolution.
The 21st century has been marked by increased globalization.
The 19th century was a time of great political upheaval.
pay attention to the difference between century and centuries (plural form). Do not use abbreviations when writing century. Remember to use two numerals when referring to a particular century.