frontier
nounUK /ˈfrʌntɪə/
US /frʌnˈtɪr/
The frontier is the far edge of a place where people have not yet settled.
Long ago, pioneers traveled west to explore the frontier.
RELATED WORDS
OTHER MEANINGS
2. The limit of what is known or developed in a subject.
Scientists are pushing the frontiers of medicine.
3. A border between two countries.
The soldiers guarded the frontier between the two nations.
4. The most advanced or newest part of an activity.
Space is often called the final frontier.