frontier
noun
the part of a country that borders another country; boundary; border.
frontiers
-
pluralof frontier.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The DMZ is one of the world's most heavily fortified frontiers, and landmine incidents have previously heightened tensions between the two countries.
From Barron's ● Oct. 12, 2026
Although the research focused on two regions of the Amazon, the scientists say its conclusions may also apply to tropical deforestation frontiers elsewhere in the world.
From Science Daily ● Sep. 21, 2026
Actually, I take that back – consulting her most devoted fans will open new frontiers for you.
From Salon ● Aug. 29, 2026
China’s Moonshot AI has launched an artificial-intelligence model it says outperforms some cutting-edge U.S. systems, the latest sign that Chinese labs can rival American counterparts in critical technology frontiers.
From The Wall Street Journal ● Jul. 17, 2026
“We were expanding beyond ourselves, beyond our own planet, pushing back frontiers, bettering ourselves.”
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
