Definition of mass noun noun from the Oxford Advanced American Dictionary

     

    mass noun

     noun
    noun
     
    (grammar)
     
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  1. 1an uncountable noun
  2. 2 a noun that is usually uncountable but can be made plural or used with a or an when you are talking about different types of something. For example, bread is used as a mass noun in the store sells several different breads.
See the Oxford Advanced Learner's Dictionary entry: mass noun