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Definition of frontier
1a : a border between two countries the frontier between Canada and the U.S.b obsolete : a stronghold on a frontier
2a : a region that forms the margin of settled or developed territory were sent on an expedition to explore the western frontierb : the farthermost limits of knowledge or achievement in a particular subject frontiers in immunologyc : a line of division between different or opposed things the frontiers separating science and the humanities — R. W. Clarkd : 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
frontier
adjectiveExplore Merriam-Webster
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 of frontier from the Web
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The rise in refugee resettlement in Mexico has paralleled a decrease in immigration to the United States, with apprehensions by U.S. Border Patrol down sharply at the frontier — especially of unaccompanied children and families like Cruz’s.
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The rise in refugee resettlement in Mexico has paralleled a decrease in immigration to the United States, with apprehensions by U.S. Border Patrol down sharply at the frontier — especially of unaccompanied children and families like Cruz’s.
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Their analysis published in Frontiers in Nutrition found that seniors at risk for memory decline received the biggest perks from eating chocolate.
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President George Washington’s new administration faced a broiling frontier war in the Ohio Valley and Great Lakes regions, where Indian nations had long been resisting American settlement.
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Craft spirits could be the next frontier, said Hammond and his supporters.
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When the country opened to the outside world in 2011 after decades of military rule, the former British colony held promise as one of the world’s hottest tourist destinations, a last frontier for adventure travel.
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But, not all the stories originate from Alabama's frontier times.
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Food is Amazon’s final frontier, according to David Portalatin, an industry analyst with NPD Group, a market research company.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'frontier'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of frontier
Middle English fronter, from Anglo-French frountere, fronter, from front
FRONTIER Defined for English Language Learners
frontier
playDefinition of frontier for English Language Learners
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: a border between two countries
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: a distant area where few people live
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: the limits of knowledge in a particular field
FRONTIER Defined for Kids
Definition of frontier for Students
1 : a border between two countries
2 : the edge of the settled part of a country
Definition of frontier for Students
: of, living in, or situated in the frontier frontier towns frontier families
Learn More about frontier
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See words that rhyme with frontier Thesaurus: All synonyms and antonyms for frontier Spanish Central: Translation of frontier Nglish: Translation of frontier for Spanish speakers Britannica English: Translation of frontier for Arabic speakers Britannica.com: Encyclopedia article about frontier
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