tribalism - definition and synonyms

noun [uncountable] 

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/ˈtraɪbəˌlɪz(ə)m/
  1. a way of thinking or behaving in which people are more loyal to their tribe than to their friends, their country, or any other social group
     Synonyms and related words
    1. a.
      very strong loyalty that someone feels for the group they belong to, usually combined with the feeling of disliking all other groups or being different from them
       Synonyms and related words