common knowledge

/K AA1 M AH0 N AA0 L AH0 JH/
noun
  1. 1

    That which is known by most people, and thus cannot reasonably be contested.

  2. 2

    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.

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Source: https://en.wiktionary.org/wiki/common%20knowledge

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