(also quadro·phon·ic ) / ˌkwɒdrəˈfɒnɪk; NAmE ˌkwɑːdrəˈfɑːn-/ adjective
( of a system of recording or broadcasting sound ) coming from four different speakers at the same time
—compare mono , stereo
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WORD ORIGIN
1960s: from quadri- four + a shortened form of stereophonic (see stereo ).