as in marginal
located at or near a border
a frontier town with a reputation for vice and lawlessness
Synonyms & Similar Words
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Antonyms & Near Antonyms
1
as in border
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
2
as in countryside
a rural region that forms the edge of the settled or developed part of a country
Alaska has been called America's last frontier
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Example Sentences
Examples are automatically compiled from online sources to
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Recent Examples of frontier
Charlie Campbell,
Time,
11 Dec. 2025
Fareed Zakaria,
Washington Post,
19 June 2026
In Starman, Tom Adams is an architect of the future who launches a historic expedition to Mars, positioning himself at the forefront of humanity’s next great frontier.
—
Anthony D'alessandro,
Deadline,
18 June 2026
See All Example Sentences for frontier
Adjective
That worried Huang, who fears a Chinese rival, and White House officials, who believe Chinese dependence on non-frontier American chips is the best way to ensure a lead in AI.
—
Charlie Campbell,
Time,
11 Dec. 2025
Noun
Anthropic, the maker of the frontier AI model Mythos and its commercially available cousin Fable, was given little warning and, according to reports, roughly 90 minutes to comply.
—
Fareed Zakaria,
Washington Post,
19 June 2026
In Starman, Tom Adams is an architect of the future who launches a historic expedition to Mars, positioning himself at the forefront of humanity’s next great frontier.
—
Anthony D'alessandro,
Deadline,
18 June 2026
See All Example Sentences for frontier
Recent Examples of Synonyms for frontier
Adjective
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But in most of the country, the AI infrastructure boom has likely had a more marginal impact on electricity prices compared to grid damage sustained by extreme weather events or the costs of utility companies’ capital expenditures that are passed on to consumers.
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The $100 won will be considered taxable income and subject to taxation at the taxpayer’s marginal tax rate.
Noun
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Tucked along the Green River, not far from the Utah-Wyoming border, the refuge serves as a vital sanctuary for migratory birds and threatened species like the bald eagle.
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Allowed Trump to turn back asylum-seekers at the southern border and to immediately halt temporary protection from deportation for Syrians and Haitians.
Noun
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The crowd behind the cause Ordinary men and women in colonial cities and the countryside are behind the screen of the declaration’s list of charges too.
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In the film’s ferocious climax, Jim is shot but escapes with Selena and Hannah, and the story closes (28 days later) back in the countryside as a jet flies over and augurs their rescue.
Noun
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Leiter said the final destination of the framework is peace between the two countries.
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Many countries and global organizations have pledged support and aid.
Noun
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Fully restored to its original glory, the mansion is located on the banks of the backwaters of Kerala, and is only accessible by boat from the mainland.
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The movie goes from this weird, seedy love motel to the industrial backwaters, and these long walks and talks down empty streets.
Noun
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In Beach Enclave’s hinterland, there are plenty of enjoyable distractions, including a 4,500-square-foot golf complex, with putting green, courts for tennis, padel, and pickleball, fitness center, and games lounge.
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The menu is top-tier and uses as much local produce from the ocean and nearby hinterland as possible.
Noun
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Bring extra food and water, fuel up your vehicle in town, prepare for longer travel times than expected, check weather forecasts, and bring essentials for backcountry travel.
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The conflict in the Carolina backcountry was intense, characterized by a brutal struggle that often pitted neighbor against neighbor, and family member against family member.
Noun
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Now officials are urging residents to trim any unruly bushes or hedges that may impact traffic or sidewalks.
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But over the nearly one-and-a-half years since the 2025 mega-fires, native and invasive grasses, bushes and trees have begun to regrow, weaving flammable greenery across the landscape.
Cite this Entry
“Frontier.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontier. Accessed 3 Jul. 2026.
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