Grammatical category of nouns which marks quantity. Number can also be applied to other parts of speech ( adjective, pronoun, finite verb form) through agreement. The most common categories of number are singular and plural; there are also systems...

When a noun or verb refers to one thing, it is said to be ‘singular’. Uncountable nouns like ‘cotton’ or ‘envy’ tend to be regarded as singular to match with the verbs they are used with. ‘Singular’...

...

In linguistics, grammatical number is a grammatical category of nouns, pronouns, and verb agreement that expresses count distinctions (such as "one" or "more than one").[1] The count distinctions typically, but not always, correspond to the actual count...