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
Having an opportunity to use the Air Force’s state-of-the-art testing facilities on a regular basis could potentially give start-ups and innovators a head start in pioneering new frontiers for drone warfare.
—
Zita Ballinger Fletcher, Forbes.com, 17 May 2026
The Safavids had been in conflict with the Sunni forces on two frontiers, with Ottoman aggression to the west and Uzbek opposition to the east, ever since Ismāʿīl I, great-grandfather of ʿAbbās I, made Shiʿism Persia’s state religion in the 16th century.
—Encyclopedia Britannica, 8 May 2026
Climate change sends rodents to new frontiers Argentina in recent years endured a historic drought.
—Isabel Debre, Los Angeles Times, 6 May 2026
Pichai is already looking toward new frontiers.
—Andrew R. Chow, Time, 6 May 2026
Even populous British colonies like Virginia and Pennsylvania grew blurry on their western frontiers, where indistinct borders were protected by a few lonely forts.
—Daniel Immerwahr, New Yorker, 4 May 2026
But the conventional wisdom that Israel has not been active on the frontiers of public diplomacy simply isn’t true, according to Ilan Manor, a senior lecturer at Ben-Gurion University who has long studied the Foreign Ministry’s online presence.
—Asaf Elia-Shalev, Sun Sentinel, 4 May 2026
The frontiers of materials science, sensing, and engineering offer hope for faster, cheaper, less energy-intensive solutions to this grand challenge.
—Alaina Harkness, Chicago Tribune, 3 May 2026
Decades later, that same organization awarded Huang its highest distinction, the Medal of Honor, for advancing the frontiers of technology.
—Preston Fore, Fortune, 29 Apr. 2026
Zita Ballinger Fletcher, Forbes.com, 17 May 2026
The Safavids had been in conflict with the Sunni forces on two frontiers, with Ottoman aggression to the west and Uzbek opposition to the east, ever since Ismāʿīl I, great-grandfather of ʿAbbās I, made Shiʿism Persia’s state religion in the 16th century.
—Encyclopedia Britannica, 8 May 2026
Climate change sends rodents to new frontiers Argentina in recent years endured a historic drought.
—Isabel Debre, Los Angeles Times, 6 May 2026
Pichai is already looking toward new frontiers.
—Andrew R. Chow, Time, 6 May 2026
Even populous British colonies like Virginia and Pennsylvania grew blurry on their western frontiers, where indistinct borders were protected by a few lonely forts.
—Daniel Immerwahr, New Yorker, 4 May 2026
But the conventional wisdom that Israel has not been active on the frontiers of public diplomacy simply isn’t true, according to Ilan Manor, a senior lecturer at Ben-Gurion University who has long studied the Foreign Ministry’s online presence.
—Asaf Elia-Shalev, Sun Sentinel, 4 May 2026
The frontiers of materials science, sensing, and engineering offer hope for faster, cheaper, less energy-intensive solutions to this grand challenge.
—Alaina Harkness, Chicago Tribune, 3 May 2026
Decades later, that same organization awarded Huang its highest distinction, the Medal of Honor, for advancing the frontiers of technology.
—Preston Fore, Fortune, 29 Apr. 2026
Recent Examples of Synonyms for frontiers
borders
Noun
-
Thailand’s popularity with Russian tourists has boomed as the Southeast Asian nation kept its borders open to Russian passport holders following Moscow’s 2022 invasion of Ukraine in contrast to some European countries, which implemented new restrictions on Russian visitors.—
Kocha Olarn,
CNN Money,
20 May 2026
-
Drones crossing borders raise tensions In recent months, Ukrainian drones aimed at Russia have crossed or come down in NATO territory on numerous occasions.—
Liudas Dapkus,
Los Angeles Times,
20 May 2026
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 22 May. 2026.
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