If you amplify a sound, you make it louder, usually by using electronic equipment. This landscape seemed to trap and amplify sounds The music was amplified with microphones `This is the police,' came the amplified voice from the helicopter. + amplification am·pli·fi·ca·tion a voice that needed no amplification
To amplify something means to increase its strength or intensity. The mist had been replaced by a kind of haze that seemed to amplify the heat