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Definitions

Wiktionary

  1. n. What "everybody knows", often with reference to a specific community; something which cannot reasonably be contested.
  2. n. A special kind of knowledge for a group of agents, such that when all the agents in a group G know p, they all know that they know p, they all know that they all know that they know p, and so on ad infinitum.

WordNet 3.0

  1. n. anything generally known to everyone

Examples

  • “It seemed to me that he was over-ready to impart it to strangers, but later, thinking it over, I realized that it was only such matters as were probably common knowledge — or merely current rumors.”

    The Black Mountain

  • “Langsdorff had already sent word to the Harbourmaster that the Graf Spee would sail at or shortly after 1815, and this news soon became common knowledge among the crowd.”

    Graf Spee

  • “The telex operator — didn't Phillip Chen say he had already had copies of some of the telexes? — or cleaners, or phone operators, it would be impossible to gauge who but the news would be common knowledge soon, whatever he or Murtagh did.”

    Noble House

  • “IT was common knowledge that Smugg was engaged to be married.”

    Frivolous Cupid

  • “For it was common knowledge that Big Alec was as willing to bribe as to fight, and that of late years more than one patrolman had handled the fisherman's money.”

    The King of the Greeks

  • “But now they only prove you were once free of uplands which you do not visit nowadays: and that common knowledge is a secret every wife must share half-guiltily with her husband -- even in your happiest matrimonial ventures -- as certainly as it is the one topic they may not ever discuss with profit.”

    The Cream of the Jest: A Comedy of Evasions

  • “We chose KillRoy It was common knowledge that KillRoy branded the faces with the letter K.”

    Tell No One

  • “It was common knowledge that the Yugoslavs hated each other more than they could ever hate a foreigner or an invader.”

    Captain Corelli's Mandolin

  • “It was common knowledge among the people on the campus that wherever Zhao Hongbo was, there you would find Shen Xue too.”

    Simon & Schuster: THE SECOND MARK

  • “The common knowledge of Christ is the pearl in the toad's head -- the grape that grows upon thorns; it may be found in men unsanctified.”

    The Almost Christian Discovered; or, the False Professor Tried and Cast.

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‘common knowledge’ has been looked up 158 times, and is not a valid Scrabble word.