delimitation       
noun [ C or U ]  formal uk/ˌdiː.lɪm.ɪˈteɪ.ʃən/ us/ˌdiː.lɪm.əˈteɪ.ʃən/
 定界,划界;限定
the marking or describing of the limits of something
  The main focus was the delimitation of responsibilities between the police and the judiciary.  主要的重点是划定警察和司法机关之间的责任。 
 - More examples
 - There was a constitutional review of the delimitation of powers between Brussels and national capitals.
 - The country instituted proceedings at the International Court of Justice calling for a delimitation of the maritime boundary.
 - The delimitation of the sea is the most pressing security issue affecting the region.
 - At the horizon where the sky and sea met, the delimitation could scarcely be discerned.