fraternization

/frəˌtɜrnəˈzeɪʃən/
noun
  1. Friendly or social interaction between people or groups, especially when it is not allowed or is considered inappropriate in a formal or professional setting.
    • The company has strict rules against fraternization between managers and their direct reports.
    • During the war, fraternization between soldiers and the local population was forbidden.
    • The teacher was warned about fraternization with students outside of school activities.
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