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
The push for menstrual leave may represent the next frontier in recognizing the full spectrum of women's health needs in the workplace.
—Newsweek Staff, MSNBC Newsweek, 4 Apr. 2025
Artificial Integrity is the new frontier to make AI agents integrity-led with regard to context-aware decision-making, including social, ethical, and moral reasoning, and therefore, the ability to adapt dynamically across diverse decision-making frameworks.
—Hamilton Mann, Forbes.com, 3 Apr. 2025
Advancements in neurotechnology are ushering in a new frontier of brain health, one that could have a profound impact on not just longevity, but overall quality of life.
—Nicole Kliest, Vogue, 2 Apr. 2025
Robbing the bank Plumbing seafloor wealth For the past decade, the mining industry has argued that the ocean floor is an essential frontier for rare-earth metals needed in the batteries used in cellphones and laptops.
—Ian Urbina, Los Angeles Times, 28 Mar. 2025
See All Example Sentences for frontier
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Newsweek Staff, MSNBC Newsweek, 4 Apr. 2025
Artificial Integrity is the new frontier to make AI agents integrity-led with regard to context-aware decision-making, including social, ethical, and moral reasoning, and therefore, the ability to adapt dynamically across diverse decision-making frameworks.
—Hamilton Mann, Forbes.com, 3 Apr. 2025
Advancements in neurotechnology are ushering in a new frontier of brain health, one that could have a profound impact on not just longevity, but overall quality of life.
—Nicole Kliest, Vogue, 2 Apr. 2025
Robbing the bank Plumbing seafloor wealth For the past decade, the mining industry has argued that the ocean floor is an essential frontier for rare-earth metals needed in the batteries used in cellphones and laptops.
—Ian Urbina, Los Angeles Times, 28 Mar. 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 13 Apr. 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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