of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system: a quadraphonic recording.
Also, four-channel, quadriphonic, quadrasonic [kwod-ruh-son-ik] .

1965–70; quadra-, variant of quadri- + -phonic, as in stereophonic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1969, irregular formation from quadri- "four" + phonic, from Gk. phone "sound, voice" (see fame). The goal was to reproduce front-to-back sound distribution in addition to side-to-side stereo.
Online Etymology Dictionary, © 2010 Douglas Harper
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