transcription, транскрипция: [ frʌntɪə(r), -tɪə(r) ]
( frontiers)
1.
A frontier is a border between two countries. ( BRIT; in AM, usually use border )
It wasn’t difficult then to cross the frontier.
N-COUNT
2.
When you are talking about the western part of America before the twentieth century, you use frontier to refer to the area beyond the part settled by Europeans.
...a far-flung outpost on the frontier.
N-COUNT
3.
The frontiers of something, especially knowledge, are the limits to which it extends.
...pushing back the frontiers of science.
...technological frontiers.
N-COUNT : usu pl , usu N of n , adj N