I. ster‧e‧o¹ /ˈsteriəʊ, ˈstɪər- $ ˈsterioʊ, ˈstɪr-/ noun (plural stereos)

1. (also ˈstereo ˌsystem) [countable] a machine for playing records, CDs etc that produces sound from two speakers:
a stereo with good speakers
on a stereo
He was listening to the Beatles on the car stereo.

2. in stereo if sound is played or broadcast in stereo, it is directed through two speakers
⇒ personal stereo

[TahlilGaran] Dictionary of Contemporary English ▲

II. stereo² (also ster‧e‧o‧phon‧ic) /ˌsteriəˈfɒnɪk◂, ˌstɪər- $ ˌsteriəˈfɑːnɪk◂, ˌstɪr-/ adjective
[Date: 1900-2000; Origin: stereophonic (1900-2000), from Greek stereos 'solid' + English phonic]
using a recording or broadcasting system in which the sound is directed through two speakers ⇒ mono, quadraphonic:
stereo equipment

[TahlilGaran] Dictionary of Contemporary English ▲