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Entry 5 senses · 3 variants Webster, 1913

Frontier

/frən-tĭr'/ · Fron·tier · IPA /fɹʌnˈtɪɹ/
01 n. That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a…
  1. 1.
    That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.
  2. 2.
    An outwork.(Fort.) [Obs.]
    “Palisadoes, frontiers, parapets.” — Shak.
02 a. Lying on the exterior part; bordering; conterminous; as, a frontier town.
  1. 1.
    Lying on the exterior part; bordering; conterminous; as, a frontier town.
  2. 2.
    Of or relating to a frontier.
03 v. i. To constitute or form a frontier; to have a frontier; -- with on.
  1. 1.
    To constitute or form a frontier; to have a frontier; -- with on.[Obs.]