Definitions for "medium wave"
Keywords:  khz, radio, kilohertz, vhf, band
a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kiloHertz and 3000 kiloHertz)
The frequency band 300-3000 kHz.
Radio signals from 300 to 3000 kHz, although this term is often used to mean any radio signal in the AM broadcast band (540 to 1700 kHz).