Definition of: stereophonic

(ster′ē·ə·fon′ik, stir′-) adjective
1. Pertaining to, designed for, or characterized by the perception of sound by both ears; binaural.
2. Denoting a system of sound transmission in which two or more microphones or loudspeakers are so placed as to give the effect of hearing with both ears simultaneously, as in wide–screen motion pictures and certain types of radio receivers.
—ster′e·o·phon′i·cal·ly adverb