Usually means: Older sibling, often protective, authoritative.
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We found 27 dictionaries that define the word big brother:

General (21 matching dictionaries)
  1. big brother: Merriam-Webster
  2. Big Brother: Oxford Learner's Dictionaries
  3. big brother: American Heritage Dictionary of the English Language
  4. Big Brother: Collins English Dictionary
  5. Big Brother, big brother: Vocabulary.com
  6. Big-Brother, big-brother: Wordnik
  7. Big Brother, Big brother: Cambridge Advanced Learner's Dictionary
  8. Big Brother, big brother: Wiktionary
  9. big brother: The Wordsmyth English Dictionary-Thesaurus
  10. big brother: Infoplease Dictionary
  11. Big Brother (Albania), Big Brother (Albanian TV series), Big Brother (Albanian season 8), Big Brother (Albanian season 9), Big Brother (American TV series), Big Brother (Australia), Big Brother (Australia series 6), Big Brother (Australian TV series), Big Brother (Australian season Big+Brother+++(Australian+++season+++1)), Big Brother (Australian season 2), Big Brother (Australian season 3), Big Brother (Australian season 4), Big Brother (Australian season 5), Big Brother (Australian season 6), Big Brother (Australian season 7), Big Brother (Australian season 8), Big Brother (Australian season 9), Big Brother (Belgian TV series), Big Brother (Belgium), Big Brother (British TV series), Big Brother (British series Big+Brother+++(British+++series+++1)), Big Brother (British series 2), Big Brother (British series 3), Big Brother (British series 4), Big Brother (British series 5), Big Brother (British series 6), Big Brother (British series 7), Big Brother (British series 8), Big Brother (British series 9), Big Brother (Bulgaria), Big Brother (Bulgarian TV series), Big Brother (Colombia), Big Brother (Croatian TV series), Big Brother (Croatian season 5), Big Brother (Croatian season 7), Big Brother (Czech TV series), Big Brother (Danish TV series), Big Brother (Danish season 5), Big Brother (Danish season 6), Big Brother (David Bowie song), Big Brother (Dutch TV series), Big Brother (Dutch season Big+Brother+++(Dutch+++season+++1)), Big Brother (Dutch season 3), Big Brother (Dutch season 4), Big Brother (Dutch season 5), Big Brother (Finland TV series), Big Brother (Finnish TV series), Big Brother (Finnish season Big+Brother+++(Finnish+++season+++1)), Big Brother (Finnish season 2), Big Brother (Finnish season 3), Big Brother (Finnish season 4), Big Brother (Finnish season 5), Big Brother (Finnish season 6), Big Brother (Finnish season 7), Big Brother (Finnish season 8), Big Brother (Finnish season 9), Big Brother (French TV series), Big Brother (German TV series), Big Brother (German season Big+Brother+++(German+++season+++1)), Big Brother (German season 3), Big Brother (German season 4), Big Brother (German season 5), Big Brother (German season 6), Big Brother (German season 7), Big Brother (German season 8), Big Brother (German season 9), Big Brother (Glee), Big Brother (Greece), Big Brother (Greek TV series), Big Brother (Greek season Big+Brother+++(Greek+++season+++1)), Big Brother (Greek season 2), Big Brother (Greek season 3), Big Brother (Greek season 4), Big Brother (Greek season 5), Big Brother (Greek season 6), Big Brother (Hungarian TV series), Big Brother (Hungary), Big Brother (Indonesia), Big Brother (Indonesian TV series), Big Brother (Israeli TV series), Big Brother (Israeli season 2), Big Brother (Israeli season 5), Big Brother (Israeli season 7), Big Brother (Israeli season 9), Big Brother (Kanye West song), Big Brother (Mexican TV series), Big Brother (Netherlands), Big Brother (Nineteen Eighty-Four), Big Brother (Norwegian TV series), Big Brother (Only Fools and Horses), Big Brother (Orwell), Big Brother (Polish TV series), Big Brother (Polish season 4), Big Brother (Polish season 6), Big Brother (Polish season 7), Big Brother (Portugal), Big Brother (Portuguese TV series), Big Brother (Portuguese season 5), Big Brother (Quebec TV series), Big Brother (Romanian TV series), Big Brother (Russian TV series), Big Brother (Serbian TV series), Big Brother (Serbian season Big+Brother+++(Serbian+++season+++1)), Big Brother (Serbian season 2), Big Brother (Serbian season 4), Big Brother (Serbian season 5), Big Brother (Slovak TV series), Big Brother (Slovenian TV series), Big Brother (Slovenian season 3), Big Brother (Slovenian season 4), Big Brother (South Africa), Big Brother (South African TV series), Big Brother (Sweden and Norway), Big Brother (Swedish TV series), Big Brother (Swedish season 5), Big Brother (Swedish season 6), Big Brother (Swedish season 7), Big Brother (Swedish season 8), Big Brother (Swiss TV series), Big Brother (TV series), Big Brother (Thailand), Big Brother (U.S.), Big Brother (U.S. TV series), Big Brother (UK), Big Brother (UK series Big+Brother+++(UK+++series+++1)), Big Brother (UK series 2), Big Brother (UK series 3), Big Brother (UK series 4), Big Brother (UK series 5), Big Brother (UK series 6), Big Brother (UK series 7), Big Brother (UK series 8), Big Brother (US), Big Brother (USA season 2), Big Brother (US TV series), Big Brother (Ukrainian TV series), Big Brother (Yes Minister), Big Brother (disambiguation), Big Brother (film), Big Brother (franchise), Big Brother (magazine), Big Brother (software), Big Brother, Big brother, The Big Brother: Wikipedia, the Free Encyclopedia
  12. big brother: Rhymezone
  13. big brother: FreeDictionary.org
  14. big brother: Mnemonic Dictionary
  15. big brother: TheFreeDictionary.com
  16. Big Brother (UK TV series): Wikipedia, the Free Encyclopedia
  17. big brother: Dictionary.com
  18. Big Brother: Online Etymology Dictionary
  19. big brother: Longman Dictionary of Contemporary English

Computing (2 matching dictionaries)
  1. big brother: Netlingo
  2. Big Brother: Encyclopedia

Miscellaneous (4 matching dictionaries)
  1. A Brief Critical Dictionary of Education (No longer online)
  2. big brother: A Word A Day
  3. Big Brother: Idioms
  4. big brother: Wordcraft Dictionary

(Note: See big_brothering as well.)

Definitions from Wiktionary (Big brother)

noun:  Unwarranted, invasive, and discreet surveillance, especially of a people by its government
noun:  Any omnipresent figurehead representing oppressive control
noun:  (often childish) A sibling's older brother.
noun:  (figurative) Something that is bigger in comparison.
noun:  (figurative) early mobile phones (in China)
noun:  Alternative form of Big Brother [Unwarranted, invasive, and discreet surveillance, especially of a people by its government]

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