(IELTS4000) frontier | Definition: part of a country which fronts or faces another country or an unsettled region; border, confine, or extreme part of a country
| (SAT5000) frontier | Definition: The part of a nation's territory that abuts upon another country. frowzy
| | (ESS4000) frontier | Definition: A frontier is a border between two regions or countries. | Example: →A fence was built along the frontier where the river curved.
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