Longman Dictionary of Contemporary English - stereo

~1 n 1 a machine for playing records, cds etc that produces sound from two speakers (speaker (3)) 2 in stereo if music, a radio programme etc is in stereo, it is being played or broadcast using a system in which sound is directed through two speakers  (This programme is being broadcast in stereo.) ~2 also stereophonic ~ adj using a system of sound recording or broadcasting in which the sound is directed through two speakers (speaker (3)) to make it seem more real  (stereo recording)  (- compare mono2, quadraphonic)