What is the meaning of N-SING marked on dictionary?

"N-SING" is an abbreviation used in dictionaries to indicate that a noun is singular. This means that the word refers to only one thing or person.

For example, in a dictionary entry, you might see:

cat (n-sing)

This means that "cat" is a singular noun, referring to one cat.

Here are some other abbreviations you might find in dictionaries related to nouns:

* N-PLURAL: This indicates a plural noun, referring to more than one thing or person.

* N-MASS: This indicates a mass noun, which refers to something that cannot be easily counted, such as water or sand.

By using these abbreviations, dictionaries help users understand the grammatical properties of words and how they should be used in sentences.