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
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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.
Origin and Etymology of frontier
Middle English fronter, from Anglo-French frountere, fronter, from front
First Known Use: 15th century
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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