frontier

The definition of a frontier a border between two countries, or the outer limit of what has been explored.

(noun)

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.

See frontier in Webster's New World College Dictionary

noun

the border between two countries
☆
1. that part of a settled, civilized country which lies next to an unexplored or undeveloped region
2. 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: ME frontere < OFr frontier < front: see front

adjective

of, on, or near a frontier

See frontier in American Heritage Dictionary 4

noun

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:

Origin: Middle English frountier

Origin: , from Old French frontier

Origin: , from front, forehead, front; see front

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