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
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
Today, the last frontiers of oil investment lie in challenging environments.
—Amena Bakr, semafor.com, 30 Jan. 2026
The ability to build and control matter at a molecular layer-by-layer scale opened up entirely new frontiers for material science and eventually nanotechnology, advancing the cutting edge of electronics and sensor development.
—Natalia Sánchez Loayza, Scientific American, 29 Jan. 2026
The societies that can advance to the frontiers of the productive power that capitalism unleashes while maintaining their coherence and élan advance to the front of the race for international status and power.
—Walter Russell Mead, The Atlantic, 24 Jan. 2026
Automating the most tractable problems Aside from recent publishing distortions, Evans’s analysis suggests that AI is largely automating the most tractable parts of science rather than expanding its frontiers.
—Elie Dolgin, IEEE Spectrum, 19 Jan. 2026
Importance of the expedition This mission targets three key frontiers.
—Mrigakshi Dixit, Interesting Engineering, 19 Jan. 2026
And there are still new frontiers where eligibility rules could be disputed this summer.
—Brendan Marks, New York Times, 1 Jan. 2026
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
Today, the last frontiers of oil investment lie in challenging environments.
—Amena Bakr, semafor.com, 30 Jan. 2026
The ability to build and control matter at a molecular layer-by-layer scale opened up entirely new frontiers for material science and eventually nanotechnology, advancing the cutting edge of electronics and sensor development.
—Natalia Sánchez Loayza, Scientific American, 29 Jan. 2026
The societies that can advance to the frontiers of the productive power that capitalism unleashes while maintaining their coherence and élan advance to the front of the race for international status and power.
—Walter Russell Mead, The Atlantic, 24 Jan. 2026
Automating the most tractable problems Aside from recent publishing distortions, Evans’s analysis suggests that AI is largely automating the most tractable parts of science rather than expanding its frontiers.
—Elie Dolgin, IEEE Spectrum, 19 Jan. 2026
Importance of the expedition This mission targets three key frontiers.
—Mrigakshi Dixit, Interesting Engineering, 19 Jan. 2026
And there are still new frontiers where eligibility rules could be disputed this summer.
—Brendan Marks, New York Times, 1 Jan. 2026
Recent Examples of Synonyms for frontiers
borders
Noun
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The El Paso incident underscores the challenges of coordinating military technology testing with civilian airspace safety, especially near international borders.—
Sujita Sinha,
Interesting Engineering,
12 Feb. 2026
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The movement of the world's richest families across borders is accelerating into what experts are calling the most significant private wealth migration ever recorded.—
Lee Ying Shan,
CNBC,
11 Feb. 2026
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 15 Feb. 2026.
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