- The definition of a frontier a border between two countries, or the outer limit of what has been explored.
- The border between United States and Canada is an example of a frontier.
- When there is a new plot of land that has never been explored, this is an example of a new frontier.
- When there is a new scientific theory that has not yet been explored, this is an example of a new frontier.
- the border between two countries
- that part of a settled, civilized country which lies next to an unexplored or undeveloped region
- the developing, often still uncivilized or lawless, region of a country
- any new field of learning, thought, etc. or any part of a field that is still incompletely investigated: often used in pl.: the frontiers of medicine
Origin: Middle English frontere ; from Old French frontier ; from front: see front
Used by arrangement with John Wiley & Sons, Inc.
- a. An international border.b. The area along an international border.
- A region just beyond or at the edge of a settled area.
- An undeveloped area or field for discovery or research: theories on the frontier of astrophysics.
Origin: Middle English frountier, from Old French frontier, from front, forehead, front; see front.