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Definition of Mass noun from the Oxford Advanced American Dictionary

     

    Mass

     noun
    noun
    NAmE//mæs//
     
     
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  1. 1mass [uncountable, countable] (especially in the Roman Catholic Church) a ceremony held in memory of the last meal that Christ had with his disciples to go to Mass a priest celebrating/saying Mass see also communion, Eucharist
  2. 2[countable] a piece of music that is written for the prayers, etc. of this ceremony Bach's Mass in B minor
See the Oxford Advanced Learner's Dictionary entry: Mass