What does the word frontier mean?

Usage examples for frontier

  1. Although he was already far beyond the frontier, he still kept up a sort of communication with the settlements, whereas at the more distant point such a communication would be extremely difficult. – Popular Adventure Tales by Mayne Reid
  2. In spite of their promise they refused to obey the Word of the Lord, fled for Egypt carrying with them Jeremiah and Baruch, and reached the frontier town of Tahpanhes. – Jeremiah by George Adam Smith
  3. Come with me, join me on the road to the frontier. – The Light That Lures by Percy Brebner