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
were sent on 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
With new capabilities being added to AI systems at a steady rate—in October, frontier AI lab Anthropic introduced the ability for its model to directly control a computer, still in beta—the complexity of governing this technology will only increase.
—Tharin Pillay, TIME, 5 Nov. 2024
This series in collaboration with the cast and crew has proven there is a hunger to explore new frontiers in an episodic format, where actors have freedom to challenge themselves and take risks.
—Nick Caruso, TVLine, 4 Nov. 2024
Nieva: One interesting thing about this moment is the big AI frontier labs are getting tons of attention.
—Richard Nieva, Forbes, 31 Oct. 2024
The frontier region has been particularly tense this month.
—David Brennan, ABC News, 24 Oct. 2024
See all Example Sentences for frontier 
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Tharin Pillay, TIME, 5 Nov. 2024
This series in collaboration with the cast and crew has proven there is a hunger to explore new frontiers in an episodic format, where actors have freedom to challenge themselves and take risks.
—Nick Caruso, TVLine, 4 Nov. 2024
Nieva: One interesting thing about this moment is the big AI frontier labs are getting tons of attention.
—Richard Nieva, Forbes, 31 Oct. 2024
The frontier region has been particularly tense this month.
—David Brennan, ABC News, 24 Oct. 2024
See all Example Sentences for frontier
Dictionary Entries Near frontier
Cite this Entry
“Frontier.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frontier. Accessed 30 Nov. 2024.
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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