as in borders
a region along the dividing line between two countries
the Apaches were once feared on both sides of the U.S.-Mexico frontier
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“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 16 Apr. 2024.
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More from Merriam-Webster on frontiers
Nglish: Translation of frontiers for Spanish Speakers
Britannica English: Translation of frontiers for Arabic Speakers
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