Category:English invariant nouns
This category should be empty. The contents of this category should now be found at Category:English indeclinable nouns. If any pages link here, please update the link, as this page may be deleted. A few English nouns do not change when inflected into the plural. These are known as "invariant nouns" (or "invariable nouns").
Note: These are not to be confused with pluralia tantum (such as bagpipes) or with uncountable nouns (also known as mass nouns and non-count nouns; invariant nouns can still be counted as in "one sheep, two sheep").
A related class are certain possessives that are (headless) elliptical noun phrases. (The chemist's is closed on Sundays. The chemist's were closed on Sundays.) See Appendix:Special uses of possessives in English.
Invariant use of non-invariant nouns
Sometimes in English, the singular form of a non-invariant noun may be used to denote a plural. This should be carefully distinguished from true invariants, where there is no plural form, as in the case of 'sheep'.
Generally, this happens with only a very few kinds of nouns:
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