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
Even Meta, which has faced its own shifting AI strategy, made moves to prepare for the release of its next frontier model, codenamed Avocado, CNBC reported last week.
—Kif Leswing, CNBC, 17 Dec. 2025
Early benchmarks suggest Gemini 3 Flash now competes closely with frontier models from both Google and OpenAI.
—Aamir Khollam, Interesting Engineering, 17 Dec. 2025
As Idaho grew from a frontier territory to a state in 1890, the Idaho Statesman grew, too.
—Idaho Statesman, 16 Dec. 2025
That missing sense may be the next frontier between digital images and physical experience.
—New Atlas, 15 Dec. 2025
See All Example Sentences for frontier
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Kif Leswing, CNBC, 17 Dec. 2025
Early benchmarks suggest Gemini 3 Flash now competes closely with frontier models from both Google and OpenAI.
—Aamir Khollam, Interesting Engineering, 17 Dec. 2025
As Idaho grew from a frontier territory to a state in 1890, the Idaho Statesman grew, too.
—Idaho Statesman, 16 Dec. 2025
That missing sense may be the next frontier between digital images and physical experience.
—New Atlas, 15 Dec. 2025
See All Example Sentences for frontier
Cite this Entry
“Frontier.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frontier. Accessed 23 Dec. 2025.
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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