From Longman Dictionary of Contemporary Englishmedium waveˈmedium ˌwave noun [uncountable] (written abbreviation MW) TCBa system of radio broadcasting using radio waves between 100 and 1,000 metres in length → long wave, FM
Examples from the Corpus
medium wave• That's why you can no longer get Radio 2 or Radio 3 on medium wave.• You can receive Network 5 all over Ireland at around 700 and 900 on the medium wave. 