Definition of channel noun from the Oxford Advanced Learner's Dictionary

    on television/radio
  1. 1  [countable] a television station What's on Channel 4 tonight? a movie/sports channel to change/switch channels CollocationsTelevisionWatching watch television/​TV/​a show/(British English) a programme/(North American English) a program/​a documentary/​a pilot/​a rerun/​a repeat see (especially British English) an ad/(especially North American English) a commercial/​the news/​the weather catch/​miss a show/​a programme/​a program/​an episode/​the news pick up/​reach for/​grab the remote (control) change/​switch channel surf (through)/ (especially North American English) flip through/ (especially British English) flick through the channels sit in front of/​switch on/​switch off/​turn on/​turn off the television/​the TV/​the TV set have/​install satellite (TV)/cable (TV)/a satellite dishShowing show a programme/​a documentary/​an ad/​a commercial screen a programme/​a documentary run an ad/​a commercial broadcast/ (especially North American English) air/​repeat a show/​a programme/​a documentary/​an episode/​a series go out/​air/​be recorded live attract/​draw (in)/pull (in) viewers be a hit with viewers/​audiences/​critics get (low/​high) ratingsAppearing be on/​appear on television/​TV/​a TV show take part in a phone-in/​a game show/​a quiz show/​a reality TV show host a show/​a programme/​series/​a game show/​a quiz show/​a talk show/(British English) a chat show be/​become/​work as a/​an (British English) TV presenter/​talk-show host/​sports commentator/​anchorman/(British English) newsreader read/​present the news appear/​perform live (on TV)Programme-making do/​film/​make a show/​a programme/​a documentary/​an episode/​a pilot/​a series/​an ad/​a commercial work on a soap (opera)/a pilot (episode)/a sitcom write/​produce a drama/​sitcom/​spin-off/​comedy series See related entries: Producing TV shows
  2. 2  [countable] a band of radio waves used for broadcasting television or radio programmes terrestrial/satellite channels See related entries: Radio technology
  3. for communicating
  4. 3  [countable] (also channels [plural]) a method or system that people use to get information, to communicate, or to send something somewhere Complaints must be made through the proper channels. The newsletter is a useful channel of communication between teacher and students. The company has worldwide distribution channels. Steps are being taken to implement a ceasefire through diplomatic channels.
  5. for ideas/feelings
  6. 4[countable] a way of expressing ideas and feelings The campaign provided a channel for protest against the war. Music is a great channel for releasing your emotions.
  7. water
  8. 5[countable] a passage that water can flow along, especially in the ground, on the bottom of a river, etc. drainage channels in the rice fields See related entries: Rivers and lakes
  9. 6[countable] a deep passage of water in a river or near the coast that can be used as route for ships See related entries: Coastlines and the sea, Rivers and lakes
  10. 7[countable] a passage of water that connects two areas of water, especially two seas the Bristol Channel See related entries: Coastlines and the sea, Rivers and lakes, Travelling by boat or ship
  11. 8the Channel [singular] the area of sea between England and France, also known as the English Channel the Channel Tunnel cross-Channel ferries news from across the Channel (= from France)
  12. Word Origin Middle English: from Old French chanel, from Latin canalis ‘pipe, groove, channel’, from canna ‘reed’ from Greek kanna, kannē, of Semitic origin. Compare with canal.Extra examples I changed channels when the news came on. If you want a visa, you will have to go through the proper channels. Irrigation channels supply the crops with water. Journalists always have indirect channels for getting information. Last year, the company launched its own TV channel. Lily surfed the channels on the television. She first tried to get a doctor’s certificate through official channels. The estate has fountains and water channels. The government hopes to settle the dispute through diplomatic channels. The government is watching economic developments across the Channel with great interest. There’s an interesting documentary on Channel 4 tonight. This channel broadcasts 24 hours a day. We crossed the Channel in stormy weather. an effective channel for communication attempts to open up new channels of communication worldwide distribution channels A channel is being dug to divert the river. Complaints must be made through the proper channels. Steps are being taken to implement a ceasefire through diplomatic channels. The drainage channels had survived since the Roman occupation. The newsletter is a useful channel of communication between teacher and students. What’s on Channel 4 tonight? a movie/​sports channel terrestrial/​satellite/​cable/​digital channels
See the Oxford Advanced American Dictionary entry: channel