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Definition frontier in British English

frontier noun

noun
/frʌnˈtɪə(r)/
1

a border between two countries, especially one with official points where people or vehicles cross

Example

the frontier between Israel and Lebanon

Example

Italy's frontier with Switzerland

Example

troops massing at the frontier

Synonyms and related words
1.1

the outer edge of a country or area that is the furthest point where people have started to live and build towns

Synonyms and related words
1.2

the western edge of the US that Europeans had reached in the 17th, 18th, and 19th centuries

Synonyms and related words
1.3

on or relating to a frontier

Example

frontier controls

Example

a frontier town

Example

Armed police manned the frontier post.

Synonyms and related words
2

the most advanced or recent ideas about something

Example

Their work was on the frontiers of science.

Example

We are dedicated to experimentation, to pushing back the frontiers.

Synonyms and related words
Definition frontier in British English