D defs.my
Entry 1 sense Webster, 1913

Demarcation

/dēmˌ-är-kāsh'-ən/ · De·mar·ca·tion · IPA /ˌdɛm.ɑɹˈkeɪ.ʃən/
01 n. The act of marking, or of ascertaining and setting a limit; separation; distinction.
  1. 1.
    The act of marking, or of ascertaining and setting a limit; separation; distinction.
    “The speculative line of demarcation, where obedience ought to end and resistance must begin, is faint, obscure, and not easily definable.” Burke.