Meaning of QUADRAPHONIC in English

QUADRAPHONIC

quad ‧ ra ‧ phon ‧ ic BrE AmE , quadrophonic /ˌkwɒdrəˈfɒnɪk◂ $ ˌkwɑːdrəˈfɑː-/ adjective

using a system of sound recording, broadcasting etc in which sound comes from four different ↑ speaker s at the same time ⇨ mono , stereo

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.