Etymology
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stereo

1823 as a shortening of stereotype (n.); 1876 as a shortening of stereoscope; 1954 as a shortening of stereophonic (adj.); the noun meaning "stereophonic record or tape player" is recorded from 1964.

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Definitions of stereo
1
stereo (n.)
reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound;
Synonyms: stereophony / stereo system / stereophonic system
stereo (n.)
two photographs taken from slightly different angles that appear three-dimensional when viewed together;
Synonyms: stereoscopic picture / stereoscopic photograph
2
stereo (adj.)
designating the reproduction of sound using two or more independent audio channels;
Synonyms: stereophonic / two-channel
From wordnet.princeton.edu