Pronunciation: (frun-tēr', fron-; also, esp. Brit., frun'tēr), [key]
1. the part of a country that borders another country; boundary; border.
2. the land or territory that forms the furthest extent of a country's settled or inhabited regions.
3. Often, frontiers.
a. the limit of knowledge or the most advanced achievement in a particular field: the frontiers of physics.
b. 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.
4. Math.boundary (def. 2).

of, pertaining to, or located on the frontier: a frontier town.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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