Noun

• S: (n) stereo, stereophony, stereo system, stereophonic system (reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound)
• S: (n) stereo, stereoscopic picture, stereoscopic photograph (two photographs taken from slightly different angles that appear three-dimensional when viewed together)

Adjective

• S: (adj) stereophonic, stereo, two-channel (designating sound transmission from two sources through two channels)