territorial - definition and synonyms

adjective 

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/ˌterəˈtɔːriəl/
  1. 2
    territorial animals or people do not like other animals or people entering an area that they believe belongs to them

    Sharks are extremely territorial and antagonistic towards their own kind.

derived words

territoriality

 

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/ˌterəˌtɔːriˈæləti/
noun [uncountable]