WordNet sense 1 (a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)):

groove

WordNet sense 2 ((often plural) a means of communication or access):

line, communication channel

WordNet sense 3 (a path over which electrical signals can pass):

transmission channel

WordNet sense 4 (a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance):

canal, duct, epithelial duct

WordNet sense 5 (a television station and its programs):

television channel, TV channel

WordNet sense 6 (transmit or serve as the medium for transmission):

carry, conduct, convey, transmit, conduct

WordNet sense 7 (direct the flow of):

canalize, canalise

WordNet sense 8 (send from one person or place to another):

channelize, transfer, transport, channelise, transfer, transport

WordNet sense 9 (a way of selling a company's product either directly or via distributors):

distribution channel