Definition of "stereo"
stereo
/ˈstɛ.ɹi.əʊ/
noun
countable and uncountable, plural stereos
A system of recording or reproducing sound that uses two channels, each playing a portion of the original sound in such a way as to create the illusion of locating the sound at a particular position, each offset from the other, thereby more accurately imitating the location of the original sound when the recorded or reproduced sound is heard.
(printing, colloquial) A stereotype.