the portion of the electromagnetic spectrum that includes radio waves.
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Origin of radio spectrum
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for radio spectrum
the range of electromagnetic frequencies used in radio transmission, lying between 10 kilohertz and 300 000 megahertz
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012