stereo (stereos plural )
1 adj Stereo is used to describe a sound system in which the sound is played through two speakers. Compare mono.
...loudspeakers that give all-around stereo sound.
2 n-count A stereo is a cassette or CD player with two speakers.
personal stereo (personal stereos plural )A personal stereo is a small cassette or CD player with very light headphones, which people carry round so that they can listen to music while doing something else. n-count
(=Walkman)