Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: French
Origin: frontière, from front; FRONT1

frontier

noun
     
Related topics: Geography
fron‧tier
1 [countable] especially British EnglishSG the border of a country
frontier between/with
Lille is close to the frontier between France and Belgium.
on/at the frontier
Troops established a road block on the frontier.
frontier town/area/post etc (=a town etc on a frontier)
2

the frontier

SG an area where people have never lived before, that not much is known about, especially in the western US before the 20th century:
a novel about a family's struggle on the American frontier
space, the final frontier
3

the frontiers of knowledge/physics etc

the limits of what is known about something
push back the frontiers (=discover new things)

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