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frontier Line breaks: fron|tier
Pronunciation: /ˈfrʌntɪə/

Definition of frontier in English:


1A line or border separating two countries: international crime knows no frontiers France’s frontier with Belgium figurative the frontier between thought and reality is confused [as modifier]: an end to frontier controls
More example sentences
  • Two border guards patrolling the nearby frontier with Georgia have also been reported missing since Friday night.
  • At the time the Russians said he had been shot by a border guard while crossing the frontier with Finland.
  • This frontier with Belarus was now set to become the eastern frontier of Nato itself.
border, boundary, partition, borderline, dividing line, bounding line, demarcation line;
marches, bounds
1.1The extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before Pacific settlement: his novel of the American frontier
More example sentences
  • The great slogan of the settlement of the western frontier during the middle parts of the 19th century was Get in, Get Rich, Get Out.
  • Differing colonial experiences and the settlement of the western frontier created strong and persistent regional political interests.
  • I give more credit to the nameless women who settled the frontier and thus earned the right to vote in western states.
1.2The extreme limit of understanding or achievement in a particular area: the success of science in extending the frontiers of knowledge
More example sentences
  • Space telescopes and other space-based cosmological experiments are pushing back the frontiers of knowledge about the fundamental laws and history of the universe.
  • He noted the relevance of science and technology ‘to the struggle for development and pushing back the frontiers of poverty and underdevelopment’.
  • It embodies a set of policies aimed at pushing back the frontiers of poverty, while supporting growth and creating opportunities.


Example sentences
  • Also discussed at length in the article is the frontierless character of the internet and its implications.
  • It was a place without any clear dimensions: a frontierless tract of land steeped in history.
  • However, this collaboration occurs in a frontierless economy, thanks largely to modern Internet technology.


Late Middle English: from Old French frontiere, based on Latin frons, front- 'front'.

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