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
Synonyms & Similar Words
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Recent Examples of frontiers
Quantum technology is widely viewed as one of the next major frontiers in computing.
—
Kaif Shaikh, Interesting Engineering, 31 May 2026
Three weeks ago, four women and nine children in similar circumstances returned from the same Roj camp for displaced people, which is located near the area where the frontiers of Syria, Turkey and Iraq converge.
—ABC News, 27 May 2026
Late night will continue, but more of its humor and personality is likely to surface in new frontiers.
—Brian Steinberg, Variety, 20 May 2026
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
Kaif Shaikh, Interesting Engineering, 31 May 2026
Three weeks ago, four women and nine children in similar circumstances returned from the same Roj camp for displaced people, which is located near the area where the frontiers of Syria, Turkey and Iraq converge.
—ABC News, 27 May 2026
Late night will continue, but more of its humor and personality is likely to surface in new frontiers.
—Brian Steinberg, Variety, 20 May 2026
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
Recent Examples of Synonyms for frontiers
borders
Noun
-
From the moment Lawrence had the first edition privately printed in Italy, American and British authorities confiscated copies that had been smuggled across their borders and secretly read the novel for pleasure.—
The Week US,
TheWeek,
3 June 2026
-
Nationally, the crisis has often felt insurmountable, frequently exacerbated by porous borders and passive, hands-off approaches to addiction in many states.—
John Koufos,
Sun Sentinel,
2 June 2026
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 9 Jun. 2026.
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