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

 

mono

 adjective
adjective
BrE BrE//ˈmɒnəʊ//
 
; NAmE NAmE//ˈmɑːnoʊ//
 
 
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(also monophonic) (music) recording or producing sound which comes from only one direction a mono recording compare stereo
See the Oxford Advanced American Dictionary entry: mono