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A word which indicates whether noun is singular or plural is known as a number.
There are two kinds of numbers:
Singular Number:
When a noun denotes a person/thing is one, it is called singular noun/number.
Examples : Boy, Girl, Book, Cap, Lake etc.
Plural Number:
When a noun denotes more persons/things is called plural noun/number.
Examples : Boys, Girls, Books, Caps, Lakes etc.