Pronunciation (UK) IPA (key): /ˈstɛ.ri.əʊ/ (US) IPA (key): /ˈstɛər.i.oʊ/ Audio (UK)(file) Noun Singular stereo Plural stereos (countable) A stereo is a system that directs sound through multiple speakers so that it seems to surround the listener and to come from more than one source.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads