Definition:
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.
Rules:
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).
Examples:
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.
Tips:
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.