What does the word demarcation mean?

Usage examples for demarcation

  1. From the beginning these two factions had been but imperfectly welded together, because their tendencies were different; but now the struggle for power between Perikles and Thucydides drew a sharp line of demarcation between them, and one was called the party of the Many, the other that of the Few. – Plutarch's Lives, Volume I (of 4) by Plutarch
  2. The country remained in possession of Portugal, in conformity to the line of demarcation agreed on between the two nations. – The Life and Voyages of Christopher Columbus (Vol. II) by Washington Irving
  3. There's no rigid line of demarcation between insanity and hysteria. – The Professor's Mystery by Wells Hastings Brian Hooker