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
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
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
Synonyms
- border
- borderland
- march
See all Synonyms & Antonyms 
Example Sentences
the frontier between Canada and the U.S. They were sent on an expedition to explore the western frontier.
Recent Examples on the Web Each week seems to bring another milestone in the new frontier of earning opportunities for college athletes. Nathan Baird, cleveland, 23 Aug. 2022 Can a Cambridge startup help to tame the wild frontier of video game voice chat? Scott Kirsner, BostonGlobe.com, 19 Aug. 2022 In each case, the goal is simple: to drive innovation and spearhead the frontier of tech and social media. Q.ai - Powering A Personal Wealth Movement, Forbes, 3 Aug. 2022 Each single-topic, hour-long episode pushes beyond the frontier of the known… embracing the wild world of true exploration in search of answers to some of the greatest mysteries of history, science and adventure. Alex Weprin, The Hollywood Reporter, 26 July 2022 The machines stand 20 feet high, weigh 60,000 pounds and represent the technological frontier of 3-D printing. New York Times, 3 July 2022 For the tribe, drones could save the lives of members and help lift its next generation out of poverty and into the frontier of technological innovation. Jessica Mathews, Fortune, 21 May 2022 The Big Picture While there are endless ways decentralized identity standards could improve the quality of our lives, one specific use case is a thriving industry currently operating at the frontier of Web3: the creator economy. Solo Ceesay, Rolling Stone, 10 May 2022 After Congress cleared civil and voting rights legislation, King embraced guaranteed income as the next frontier of the civil rights movement. Tamar Hallerman, ajc, 14 Jan. 2022 See More
Nathan Baird, cleveland, 23 Aug. 2022 Can a Cambridge startup help to tame the wild frontier of video game voice chat? Scott Kirsner, BostonGlobe.com, 19 Aug. 2022 In each case, the goal is simple: to drive innovation and spearhead the frontier of tech and social media. Q.ai - Powering A Personal Wealth Movement, Forbes, 3 Aug. 2022 Each single-topic, hour-long episode pushes beyond the frontier of the known… embracing the wild world of true exploration in search of answers to some of the greatest mysteries of history, science and adventure. Alex Weprin, The Hollywood Reporter, 26 July 2022 The machines stand 20 feet high, weigh 60,000 pounds and represent the technological frontier of 3-D printing. New York Times, 3 July 2022 For the tribe, drones could save the lives of members and help lift its next generation out of poverty and into the frontier of technological innovation. Jessica Mathews, Fortune, 21 May 2022 The Big Picture While there are endless ways decentralized identity standards could improve the quality of our lives, one specific use case is a thriving industry currently operating at the frontier of Web3: the creator economy. Solo Ceesay, Rolling Stone, 10 May 2022 After Congress cleared civil and voting rights legislation, King embraced guaranteed income as the next frontier of the civil rights movement. Tamar Hallerman, ajc, 14 Jan. 2022 See More Word History
Etymology
Middle English fronter, from Anglo-French frountere, fronter, from front
First Known Use
15th century, in the meaning defined at sense 1a
Kids Definition
frontier 1 of 2
noun
fron·tier ˌfrən-ˈtir
1
: a border between two countries
2
: the edge of the settled part of a country
frontier
2 of 2adjective
: of, living in, or situated in the frontier
frontier towns
frontier families
frontier 1 of 2
adjective
as in marginal
located at or near a border a frontier town with a reputation for vice and lawlessness Synonyms & Similar Words
Relevance
- marginal
- outer
- outside
- exterior
- borderline
- outermost
- outward
- external
- outmost
Antonyms & Near Antonyms
- interior
- inner
- central
- internal
- inside
- middle
- inward
- innermost
- mid
- inmost
frontier
2 of 2noun
1
as in border
a region along the dividing line between two countries the Apaches were once feared on both sides of the U.S.-Mexico frontier Synonyms & Similar Words
- border
- borderland
- march
- no-man's-land
2
as in countryside
a rural region that forms the edge of the settled or developed part of a country Alaska has been called America's last frontier Synonyms & Similar Words
- countryside
- backwater
- country
- backwoods
- hinterland
- backcountry
- outback
- bush
- outlands
- up-country
- (the) back of beyond
- backland(s)
- boondocks
- boonies
- sticks
