frontier

noun
fron·​tier | \ ˌfrən-ˈtir, ˈfrən-ˌtir, frän-ˈtir, ˈfrän-ˌtir \

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

Red Dead Redemption 2 Rockstar Studios; Xbox One, PS4 Further Reading Red Dead Redemption II review: Getting muddy in the wide-open frontierThe opening hours of Red Dead Redemption 2 didn’t do much to sell me on the game. Kyle Orland, Ars Technica, "Ars Technica’s best games of 2018," 24 Dec. 2018 What this means for you: Context is the new frontier for search engines, which have evolved into more than just an answer to a question. Mark Hachman, PCWorld, "Microsoft shines a 'spotlight' on Bing news searches to add more context," 27 Aug. 2018 When Pa Harney suddenly dies, Jessilyn chops her hair, binds her chest and, posing as a man, sets off into the frontier with the desperate aim of finding Noah. Sam Sacks, WSJ, "Fiction: A Proving Ground for Men and Storytellers," 16 Aug. 2018 That would almost certainly prompt Austria to impose its own checks at its southern frontier with Italy. Chris Cottrell, The Christian Science Monitor, "Immigration deal saves German government, points to European future," 9 July 2018 Because of these oddities and others, many physicists have been betting on neutrinos to open the door to the next frontier in physics. Clara Moskowitz, Scientific American, "Evidence Builds for a New Kind of Neutrino," 7 June 2018 But in the same way that western settlers came to the real American frontier seeing an empty landscape, Barlow’s metaphor making was presumptuous. Jesse Jarnow, WIRED, "The Ghost of John Perry Barlow Lives in His Posthumous Memoir," 5 June 2018 Said The Sky is ready to unleash his own exciting new frontier. Kat Bein, Billboard, "Marshmello, DJ Snake & More Dance Music Albums Coming in 2018," 29 May 2018 The studio’s latest chosen universe blends grounded combat between ostensibly humanoid robots with medieval politics transplanted to the final frontier. Steven Strom, Ars Technica, "BattleTech is a more tactical, punishing view of mech battling," 3 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

4 Jan 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 \

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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