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frontal (1)
frontal (2)
frontal bone
frontal lobe
frontal lobotomy
frontal wedging
frontcourt
frontenis
frontier
frontiersman
frontierspeople
frontierswoman
frontispiece
frontlet
frontline
frontline state
frontloading
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frontier

fron·tier [ frun tr ] (plural fron·tiers)


noun 
Definition:
 
1. international border: a border between two countries, or the land immediately adjacent to this
cross the frontier into Spain

2. edge of settlement: the part of a country with expanding settlement that is being opened up by hunters, herders, and other pioneers in advance of full urban settlement

3. limit of knowledge: the furthest limit of knowledge in a specific field
pushing back the frontiers of science

[14th century. < Anglo-Norman frounter, French frontière "front part (of an army)" < front (see front)]
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