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 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
Importance of the expedition This mission targets three key frontiers.
—Mrigakshi Dixit, Interesting Engineering, 19 Jan. 2026
As for whether comprehending the wiring of the brain really demands techniques from the frontiers of theoretical physics, questions remain.
—Lee Billings, Scientific American, 13 Jan. 2026
And there are still new frontiers where eligibility rules could be disputed this summer.
—Brendan Marks, New York Times, 1 Jan. 2026
Sleep is also emerging as one of the most significant — and most underserved — frontiers.
—Amy Francombe, Vogue, 19 Dec. 2025
Moving forward, Dalén says the future study of RNA in ancient animals will open up exciting new frontiers for understanding how these animals lived.
—Jay Kakade
december 03, New Atlas, 3 Dec. 2025
Each of the Internet’s 7 Phases overcomes the limits of the previous phase, while also opening new frontiers.
—Mallik Tatipamula, IEEE Spectrum, 27 Oct. 2025
The four-day event, a summit that closes Thursday, is aimed at unlocking new frontiers of growth.
—Sofia Celeste, Footwear News, 27 Oct. 2025
Walter Russell Mead, The Atlantic, 24 Jan. 2026
Importance of the expedition This mission targets three key frontiers.
—Mrigakshi Dixit, Interesting Engineering, 19 Jan. 2026
As for whether comprehending the wiring of the brain really demands techniques from the frontiers of theoretical physics, questions remain.
—Lee Billings, Scientific American, 13 Jan. 2026
And there are still new frontiers where eligibility rules could be disputed this summer.
—Brendan Marks, New York Times, 1 Jan. 2026
Sleep is also emerging as one of the most significant — and most underserved — frontiers.
—Amy Francombe, Vogue, 19 Dec. 2025
Moving forward, Dalén says the future study of RNA in ancient animals will open up exciting new frontiers for understanding how these animals lived.
—Jay Kakade
december 03, New Atlas, 3 Dec. 2025
Each of the Internet’s 7 Phases overcomes the limits of the previous phase, while also opening new frontiers.
—Mallik Tatipamula, IEEE Spectrum, 27 Oct. 2025
The four-day event, a summit that closes Thursday, is aimed at unlocking new frontiers of growth.
—Sofia Celeste, Footwear News, 27 Oct. 2025
Recent Examples of Synonyms for frontiers
borders
Noun
-
This lingering becomes the sound of a book in a new room, opening, its music carried in a wind that crosses borders.—
Literary Hub,
Literary Hub,
28 Jan. 2026
-
Going into the 1990s, psychiatrists were optimistic that these borders would also show up in brain scans and genetics research.—
Allison Parshall,
Scientific American,
28 Jan. 2026
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 4 Feb. 2026.
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