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
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
However, emerging frontiers in artificial intelligence, robotics, and simulation tech complicate Nally’s skepticism.
—Kaif Shaikh, Interesting Engineering, 28 Nov. 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
Many are choosing to work in more flexible capacities for longer and viewing retirement less as a full stop and more as a transition to new frontiers, including philanthropy, advisory roles, and entrepreneurship.
—Alex Ohnona, Fortune, 22 Oct. 2025
And so [Anthropic] was interested in having an in-house prototyping team that figures out what these frontiers models can do.
—PC Magazine, 21 Oct. 2025
Here’s how that research, pioneered more than 40 years ago, has led to new frontiers in modern physics, as well as 2025’s Nobel Prize in physics.
—Ethan Siegel, Big Think, 8 Oct. 2025
Recent Examples of Synonyms for frontiers
borders
Noun
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There are exact borders of a painting, but there’s a lot of freedom in these exact borders.—
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Natural gas is increasingly flowing across borders in the Middle East — even between countries that until recently had frosty relations.—
Cite this Entry
“Frontiers.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/frontiers. Accessed 13 Jan. 2026.
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