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Definition of mass noun noun from the Oxford Advanced Learner's Dictionary

mass noun

noun
 
/ˈmæs naʊn/
 
/ˈmæs naʊn/
(grammar)
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  1. an uncountable noun (= a noun that cannot be made plural or used with a or an, for example water, bread and information)
  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 shop sells several different breads.
See mass noun in the Oxford Advanced American Dictionary
trait
noun
 
 
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