frontier

Reading level: hard

Estimated CEFR level: B2 — Upper-Intermediate

Estimated from word frequency; not an official CEFR classification.

Definition

noun a wilderness at the edge of a settled area of a country
noun an international boundary or the area (often fortified) immediately inside the boundary
noun an undeveloped field of study; a topic inviting research and development

From Middle English frounter, from Old French fronter (whence Modern French frontière), from front.

Frontier of New England ravaged. — A School History of the United States, John Bach McMaster
Mai-ma-chin, on the Siberian frontier, 302. — A Wayfarer in China: Impressions of a trip across West China and Mongolia, Elizabeth Kimball Kendall
The colonists always pressed for an advance of the frontier. — Impressions of South Africa, James Bryce, Viscount Bryce

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