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Definition of frontier


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fron·tier  audio  (frn-tîr, frn-, frntîr, frn-) KEY 

NOUN:
    1. An international border.
    2. The area along an international border.
  1. A region just beyond or at the edge of a settled area.
  2. An undeveloped area or field for discovery or research: theories on the frontier of astrophysics.

ETYMOLOGY:
Middle English frountier, from Old French frontier, from front, forehead, front ; see front


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