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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Recent Examples of frontiers
The frontiers of chip technology are constantly evolving and so using the newest hardware usually provides higher performance and energy efficiency, which reduces the risks of system failure.
—
Claudia Levens, jsonline.com, 6 Mar. 2026
New particles and rare processes can be revealed through accelerator physics at or beyond the current energy frontiers, but this is not without risk.
—Big Think, 5 Mar. 2026
Addiction may be one of their next frontiers, an area where only small fractions of patients currently receive medications as treatment.
—Meg Tirrell, CNN Money, 4 Mar. 2026
In the nineteenth century, travel to remote frontiers beyond the reach of telegraph had insulated Britain’s men on the spot from London’s authority, conceding them the freedom to seize new territory.
—Alfred McCoy, Literary Hub, 26 Feb. 2026
After four grueling years, Russia controls 20% of Ukrainian territory, chipping away at its eastern frontiers in a war of attrition that has now lasted longer than the Soviet Union’s fight against Nazi Germany.
—Yuliya Talmazan, NBC news, 24 Feb. 2026
Its frontiers with Arab neighbors have shifted as a result of wars, annexations, ceasefires and peace agreements.
—Sam Mednick, Los Angeles Times, 21 Feb. 2026
To better break through modern wilderness frontiers, Bowlus' newest offering gets upgraded with the 3-in lift, all-terrain tires, spare tire mount and interior lashing system of the Adventure Package.
—New Atlas, 6 Feb. 2026
The streaming service, free and ad-supported, was called CBSN and sparked a broader movement by TV-news divisions to expand into broadband frontiers.
—Brian Steinberg, Variety, 3 Feb. 2026
Claudia Levens, jsonline.com, 6 Mar. 2026
New particles and rare processes can be revealed through accelerator physics at or beyond the current energy frontiers, but this is not without risk.
—Big Think, 5 Mar. 2026
Addiction may be one of their next frontiers, an area where only small fractions of patients currently receive medications as treatment.
—Meg Tirrell, CNN Money, 4 Mar. 2026
In the nineteenth century, travel to remote frontiers beyond the reach of telegraph had insulated Britain’s men on the spot from London’s authority, conceding them the freedom to seize new territory.
—Alfred McCoy, Literary Hub, 26 Feb. 2026
After four grueling years, Russia controls 20% of Ukrainian territory, chipping away at its eastern frontiers in a war of attrition that has now lasted longer than the Soviet Union’s fight against Nazi Germany.
—Yuliya Talmazan, NBC news, 24 Feb. 2026
Its frontiers with Arab neighbors have shifted as a result of wars, annexations, ceasefires and peace agreements.
—Sam Mednick, Los Angeles Times, 21 Feb. 2026
To better break through modern wilderness frontiers, Bowlus' newest offering gets upgraded with the 3-in lift, all-terrain tires, spare tire mount and interior lashing system of the Adventure Package.
—New Atlas, 6 Feb. 2026
The streaming service, free and ad-supported, was called CBSN and sparked a broader movement by TV-news divisions to expand into broadband frontiers.
—Brian Steinberg, Variety, 3 Feb. 2026
Recent Examples of Synonyms for frontiers
borders
Noun
-
But even for longtime Border Patrol agents, who are trained at an academy in the deserts of New Mexico and stationed along the northern and southern borders, high-density cities are unfamiliar terrain.—
Ruby Cramer,
New Yorker,
12 Mar. 2026
-
The traditionally conservative 14th Congressional District is situated in the northwest corner of Georgia and borders both Alabama and Tennessee.—
Rebecca Morin,
USA Today,
11 Mar. 2026
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 14 Mar. 2026.
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