The entries in our dictionary that have the [count] and [noncount] labels are all nouns. Every noun is used as either a count noun or a noncount noun. Some nouns can be used in both ways. So what are count and noncount nouns?
A count noun is a noun that can be counted. Some count nouns are cat, book, person, letter, and thought. Each one can be counted, and when there is more than one, it takes a plural form: cats, books, people, letters, thoughts. Below are examples of how each is used.
A noncount noun is a noun that cannot be counted. Sometimes non count nouns are called mass nouns. Non count nouns cannot be counted and so they do not have a plural form. Some noncount nouns are milk, sand, mud, homework, and happiness. Below are examples of how each is used.
Some nouns have different meanings and can be used as both count nouns and non count nouns. An example of this is breath.
When breath is used to mean "air that is inhaled and exhaled when you breathe" it is a noncount noun, as in the examples below.
When breath is used to mean "a single amount of air that you take into your lungs at one time" it is a count noun, as in the examples below.
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