[ster-ee-uh-fon-ik, steer-]
pertaining to a system of sound recording or reproduction using two or more separate channels to produce a more realistic effect by capturing the spatial dimensions of a performance (the location of performers as well as their acoustic surroundings), used especially with high-fidelity recordings and reproduction systems (opposed to monophonic ).
Compare quadraphonic.

1935–40; stereo- + phon(o)- + -ic

stereophonically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stereophonic (ˌstɛrɪəˈfɒnɪk, ˌstɪər-)
monophonic Compare quadraphonics Often shortened to: stereo (of a system for recording, reproducing, or broadcasting sound) using two or more separate microphones to feed two or more loudspeakers through separate channels in order to give a spatial effect to the sound

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The marginal lines are still evident in the huge tri-sectioned screen, and the stereophonic sound is still deafening.
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