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Quite simply, a singular noun is a noun that refers to only one person, one place, one thing, or one idea. If you look at one object and name it, you have an example of a singular noun. For example there is one lamp on my bookcase and one chair at my desk.
The plural (sometimes abbreviated PL), in many languages, is one of the values of the grammatical category of number. Plural of nouns typically denote a quantity other than the default quantity represented by a noun, which is generally one (the form that represents this default quantity is said to be of singular number).