ˈɛə ˈɛəɹ ˈmel.ə.di ˈmɛl.ə.di tjuːn t(j)un tjuːn t(j)un adjust the pitches of (musical instruments) My piano needs to be tuned adjust for (better) functioning tune the engine the adjustment of a radio receiver or other circuit to a required frequency the property of producing accurately a note of a given pitch he cannot sing in tune the clarinet was out of tune a succession of notes forming a distinctive sequence she was humming an air from Beethoven