mass noun - definition and synonyms

noun [countable] linguistics 

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singularmass noun
pluralmass nouns
  1. a noun such as ‘soap’ that is usually uncountable but is also used with ‘a’ or ‘an’, or in the plural, to talk about different types of something. For example the nounsoap’ in ‘Wash your hands with soap and water’ is uncountable, while in ‘You should choose a mild soap’ and ‘Some soaps are very strongly perfumed’, ‘soap’ is countable. A mass noun is used in both these ways.