Sound reproduction systems that use two channels to create the illusion of sound coming from different directions; music players with stereo sound.
From Greek 'stereos,' meaning 'solid' or 'three-dimensional,' combined with '-phonic' (relating to sound). The term emerged in the 1950s to describe true three-dimensional audio reproduction.
The prefix 'stereo-' literally means 'solid' in Greek, but we use it for sound because in the 1950s scientists wanted to emphasize that stereo creates the illusion of three-dimensional space rather than flat, mono sound.
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