English

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

 

quadraphonic

 adjective
(also quadrophonic) adjective
BrE BrE//ˌkwɒdrəˈfɒnɪk//
 
; NAmE NAmE//ˌkwɑːdrəˈfɑːnɪk//
 
 
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(of a system of recording or broadcasting sound) coming from four different speakers at the same time compare mono, stereo Word Origin 1960s: from quadri- ‘four’ + a shortened form of stereophonic (see stereo).
See the Oxford Advanced American Dictionary entry: quadraphonic