Source : Free On-Line Dictionary of Computing

intermodulation distortion
     
         (IMD) {Nonlinear} {distortion}
        in a system or {transducer}, characterised by the appearance
        in the output of frequencies equal to the sums and differences
        of integral multiples of the two or more component frequencies
        present in the {input} waveform.
     
        (2000-08-21)