frontier
noun
fron·tier
ˌfrən-ˈtir 
ˈfrən-ˌtir,
frän-ˈtir,
ˈfrän-ˌtir
1
a
: a border between two countries
the frontier between Canada and the U.S.
b
obsolete
: a stronghold on a frontier
2
a
: a region that forms the margin of settled or developed territory
an expedition to explore the western frontier
b
: the farthermost limits of knowledge or achievement in a particular subject
frontiers in immunology
c
: a line of division between different or opposed things
… the frontiers separating science and the humanities …—
R. W. Clark
R. W. Clark
d
: a new field for exploitative or developmental activity
… the brain lies before us as one of the last scientific frontiers here on earth.—Robert Klitzman
Robert Klitzman
frontier
adjective
Examples of frontier in a Sentence
the frontier between Canada and the U.S.
They were sent on an expedition to explore the western frontier.
Recent Examples on the Web
Anthropic has reported roughly a 1 percent success rate against its internal Claude Cowork testing, the best public number from any frontier vendor.
—Janakiram Msv, Forbes.com, 17 May 2026
The Polish soldiers patrolling the frontier do not describe their mission in grand geopolitical terms.
—Efrat Lachter, FOXNews.com, 17 May 2026
The next frontier in the AI arms race may be a couple miles beneath the Pacific Ocean.
—Jake Angelo, Fortune, 15 May 2026
Often referred to as the next frontier of computing, quantum computers are being sought to complete calculations that are impossible for classical computers.
—Ameya Paleja, Interesting Engineering, 15 May 2026
See All Example Sentences for frontier
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Janakiram Msv, Forbes.com, 17 May 2026
The Polish soldiers patrolling the frontier do not describe their mission in grand geopolitical terms.
—Efrat Lachter, FOXNews.com, 17 May 2026
The next frontier in the AI arms race may be a couple miles beneath the Pacific Ocean.
—Jake Angelo, Fortune, 15 May 2026
Often referred to as the next frontier of computing, quantum computers are being sought to complete calculations that are impossible for classical computers.
—Ameya Paleja, Interesting Engineering, 15 May 2026
See All Example Sentences for frontier
Cite this Entry
“Frontier.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frontier. Accessed 20 May. 2026.
Copy CitationKids Definition
frontier
noun
fron·tier
ˌfrən-ˈti(ə)r
frän-
frän-
1
: a border between two countries
2
a
: a region that forms the edge of the settled part of a country
b
: the outer limits of knowledge or achievement
the frontiers of science
frontier
adjective
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