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
San Diego County’s social services could soon be expanding into a new frontier — primary care.
—Lucas Robinson, San Diego Union-Tribune, 5 Nov. 2025
Taste traditionally prepared dishes at the pioneer picnic, join in frontier festivities, toss tomahawks and enjoy family-friendly games.
—Caroline Ritzie, Cincinnati Enquirer, 5 Nov. 2025
Brazil has become the newest frontier for China’s electric vehicle boom.
—Merritt Enright, CNBC, 5 Nov. 2025
Being part of something that was being done for the first time (breaking a frontier of technology in a place where nobody thought it could be done), that’s huge.
—Christopher McFadden, Interesting Engineering, 4 Nov. 2025
See All Example Sentences for frontier
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Lucas Robinson, San Diego Union-Tribune, 5 Nov. 2025
Taste traditionally prepared dishes at the pioneer picnic, join in frontier festivities, toss tomahawks and enjoy family-friendly games.
—Caroline Ritzie, Cincinnati Enquirer, 5 Nov. 2025
Brazil has become the newest frontier for China’s electric vehicle boom.
—Merritt Enright, CNBC, 5 Nov. 2025
Being part of something that was being done for the first time (breaking a frontier of technology in a place where nobody thought it could be done), that’s huge.
—Christopher McFadden, Interesting Engineering, 4 Nov. 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 7 Nov. 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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