frontier

5 definitions • 11 examples

a border between two countries:

frontier between Some of the frontier between Germany and Poland follows the course of the river Oder.

frontier with Nepal has frontiers with both India and China.

the frontier They lived in a town close to the frontier.

the western US where settlers began to move to live in the 19th century:

The Homestead Act of 1862 gave free land to pioneers who settled the frontier.

an imaginary line that separates two ideas, qualities, states, etc., or the point at which one idea, quality, etc. becomes another:

frontier between The frontier between real life and virtual reality seems about to disappear.

He was close to the frontier between life and death.

The frontiers between the social classes were constantly shifting.

frontier of She seems to be at the frontier of a new stage in her life.

Emotionally he had crossed a frontier, and felt closer to her than ever before.

a border between two countries, or (esp. in the past in the US) a border between developed land where white people live and land where Indians live or land that is wild:

It was a movie about the hardships of frontier life in the northwest.

fig. A frontier is also a border between what is known and what is not known:

the frontiers of knowledge