multichannel (?m?lt??t?æn?l) adj (Broadcasting) having many television channelsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014multichannelPertaining to communications, usually full duplex, on more than one channel simultaneously. Multichannel transmission may be accomplished by either time-, frequency-, code-, and phase-division multiplexing or space diversity.Dictionary of Military and Associated Terms. US Department of Defense 2005.