frontier

noun
fron·​tier | \ ˌfrən-ˈtir How to pronounce frontier (audio) , ˈfrən-ˌtir, frän-ˈtir, ˈfrän-ˌtir How to pronounce frontier (audio) \

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 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
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

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Other Words from frontier

frontier adjective

Synonyms for frontier

Synonyms

border, borderland, march

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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.

Recent Examples on the Web

The free flow of people and goods across the frontier has been an important measure upholding Northern Ireland’s peace deal. Jill Lawless, The Seattle Times, "May delay: UK PM asks lawmakers for more time on Brexit," 12 Feb. 2019 The seagoing defense forces are backed on land by Prohibition forces and the Customs agents, who not only patrol the landing places along the coast but guard the thousands of miles of Canadian and Mexican frontiers. Popular Mechanics Editors, Popular Mechanics, "Rewind: What Guarding Uncle Sam's Borders Was Like in 1925," 11 Feb. 2019 Once Deraa is captured, the campaign is expected to move into the Quneitra area closer to the Golan frontier. NBC News, "U.N. urges Jordan to open border as 320,000 flee while Russian jets hit southern Syria," 5 July 2018 Three government services—the Customs, Coast Guard, and Prohibition Bureau—are directly involved in the battle to keep out contraband articles and collect the frontier tolls on others. Popular Mechanics Editors, Popular Mechanics, "Rewind: What Guarding Uncle Sam's Borders Was Like in 1925," 11 Feb. 2019 The border measure, known as the backstop, would keep the U.K. in a customs union with the EU in order to remove the need for checks along the frontier between the U.K.’s Northern Ireland and EU member Ireland after Britain leaves the bloc. Danica Kirka, The Seattle Times, "UK leader under new pressure to secure EU Brexit concessions," 29 Jan. 2019 Kingston, meanwhile, works in frontier market investment as a director of Devonport Capital. Andrea Park, Glamour, "Mark Your Calendars: Another Royal Wedding Is Happening," 19 Sep. 2018 With control over Daraa, government forces can now focus on clearing the last pockets of the opposition and, separately, the Islamic State group from the frontier at the Golan Heights, which Israel seized from Syria in a 1967 war. Washington Post, "Syrian government raises its flag over cradle of 2011 revolt," 12 July 2018 To annoy the Qataris even more, the Saudis would also turn part of the frontier into a nuclear-waste dump. The Economist, "Why Qatar is raising cows in the desert," 17 May 2018

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.

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First Known Use of frontier

15th century, in the meaning defined at sense 1a

History and Etymology for frontier

Middle English fronter, from Anglo-French frountere, fronter, from front

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Statistics for frontier

Last Updated

12 Apr 2019

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Time Traveler for frontier

The first known use of frontier was in the 15th century

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More Definitions for frontier

frontier

noun

English Language Learners Definition of frontier

: a border between two countries
: a distant area where few people live
: the limits of knowledge in a particular field

frontier

noun
fron·​tier | \ ˌfrən-ˈtir How to pronounce frontier (audio) \

Kids Definition of frontier

 (Entry 1 of 2)

1 : a border between two countries
2 : the edge of the settled part of a country

frontier

adjective

Kids Definition of frontier (Entry 2 of 2)

: of, living in, or situated in the frontier frontier towns frontier families

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Comments on frontier

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to move or proceed with twists and turns

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