Usually means: Private, unofficial lines of communication.
Definitions Related words Mentions
We found 15 dictionaries that define the word back channel:

General (13 matching dictionaries)
  1. back-channel, back channel: Merriam-Webster.com
  2. back channel: Oxford Learner's Dictionaries
  3. back channel: American Heritage Dictionary of the English Language
  4. back-channel, back channel: Vocabulary.com
  5. back-channel: Wordnik
  6. back-channel, back channel: Wiktionary
  7. back-channel, back channel: Dictionary.com
  8. Back channel: Wikipedia, the Free Encyclopedia
  9. back-channel, back channel: Rhymezone
  10. back-channel, back channel: Free Dictionary
  11. back-channel, back channel: Mnemonic Dictionary
  12. back-channel, back channel: Dictionary/thesaurus
  13. back channel: Merriam-Webster.com

Computing (1 matching dictionary)
  1. back channel: Hacking Lexicon

Slang (1 matching dictionary)
  1. back channel: Urban Dictionary

(Note: See back-channel as well.)

Definitions from Wiktionary (back channel)

noun:  The smaller of two channels in a river that diverge to form an island.
noun:  A secondary channel of activity, typically in parallel with primary channels and somewhat independent of them.
noun:  An unofficial communications channel used to make informal or subversive negotiations.
noun:  (computing) A real-time online discussion that occurs simultaneously with a verbal presentation.
noun:  (linguistics) A gesture or short prompt by which a listener invites a speaker to continue.

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