An unincorporated community in Koochiching, Minnesota. / A city in North Dakota. / An unincorporated community in Lincoln County, Wyoming. / A village in Saskatchewan.

The part of a country which borders or faces another country or unsettled region. / The most advanced or recent version of something; leading edge. / (obsolete) An outwork of a fortification.

(intransitive) To live as pioneers on frontier territory. / (transitive, obsolete) To place on the frontier.

plural of frontier

present participle of frontier

Placed on the frontiers.

(politics) Support for a frontier; especially, the argument advanced by historian Frederick Jackson Turner in 1893 that a settler colonial exceptionalism, under the guise of American democracy, was formed by appropriation of the rugged American frontier.

(chemistry) Either of a pair of orbitals, of two molecules or fragments, that overlap to form a bond; especially the HOMO and LUMO orbitals

A geographical frontier capable of being occupied and defended in a strategic manner, rather than haphazardly.

plural of scientific frontier