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Frontier
01
the outer edge of occupied or developed land, beyond which lies unsettled territory
Example
Pioneers migrated westward, steadily pushing the frontier of settlement into new territories.
During the 19th century, settlers pushed west across the Great Plains, gradually expanding the frontier of the young American nation.
02
an undeveloped field of study; a topic inviting research and development
03
an area located at a border, where two countries or regions meet
Example
The town lies right on the frontier, making it a strategic location for trade.
Customs officers work diligently at the frontier to enforce immigration laws.
