1. (noun)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
2. (adj)stereo, stereoscopic picture, stereoscopic photograph two photographs taken from slightly different angles that appear three-dimensional when viewed together
3. (adj)stereophonic, stereo, two-channel designating sound transmission from two sources through two channels