subchannel noun3 •A distinct division of a channel or frequency band. •An additional frequency owned by a television broadcaster used for less lucrative content.[…] TV shows you watched when you were younger, you'll likely find them on the subchannels of your local TV stations — which are available free to anyone with a TV set and a good antenna. — 2020 •A distinct part of an I/O channel associated with a specific device. formssubchannels
