/ ˈsteriəʊ; NAmE -oʊ/ noun ( pl. -os )
1.
(also ˈstereo system ) [ C ] a machine that plays CDs, etc., sometimes with a radio, that has two separate speakers so that you hear different sounds from each :
a car / personal stereo
Let's put some music on the stereo.
2.
[ U ] the system for playing recorded music, speech, etc. in which the sound is directed through two channels :
to broadcast in stereo
—compare mono
► stereo (also formal stereo·phon·ic / ˌsteriəˈfɒnɪk; NAmE -ˈfɑːnɪk/) adjective [ only before noun ]:
stereo sound
—compare quadraphonic