Dictionary.net

• (British) a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kiloHertz and 3000 kiloHertz)

2011 - English Dictionary Database
By DataStellar Co., Ltd

• a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kiloHertz and 3000 kiloHertz)

2006 - WordNet 3.0
By Princeton University