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

     

    mono

     noun
    noun
    BrE BrE//ˈmɒnəʊ//
     
    ; NAmE NAmE//ˈmɑːnoʊ//
     
    [uncountable]
     
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  1. 1a system of recording or producing sound which comes from only one direction recorded in mono compare stereo
  2. 2(North American English, informal) = mononucleosis
See the Oxford Advanced American Dictionary entry: mono