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WordReference Random House Learner's Dictionary of American English © 2024fron•tier /frʌnˈtɪr/USA pronunciation n. [countable]- the border between two countries:the frontier crossing.
- land that forms the furthest regions of a country or territory.
- Often, frontiers. the limit of knowledge or the most advanced achievement in a particular field:the frontiers of medical research.
adj. [before a noun] - of, relating to, or located on a frontier:a frontier town.
fron•tiers•man, n. [countable], pl. -men. WordReference Random House Unabridged Dictionary of American English © 2024fron•tier (frun tēr′, fron-; also, esp. Brit., frun′tēr),USA pronunciation n. - the part of a country that borders another country;
boundary;
border. - the land or territory that forms the furthest extent of a country's settled or inhabited regions.
- Often, frontiers.
- the limit of knowledge or the most advanced achievement in a particular field:the frontiers of physics.
- an outer limit in a field of endeavor, esp. one in which the opportunities for research and development have not been exploited:the frontiers of space exploration.
- Mathematicsboundary (def. 2).
adj. - of, pertaining to, or located on the frontier:a frontier town.
- Old French frontier, equivalent. to front (in the sense of opposite side; see front) + -ier -ier2
- Middle English frounter 1350–1400
- 1.See corresponding entry in Unabridged See boundary.
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