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| fron·tier [ frun tr ] (plural fron·tiers) |
noun |
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| Definition: |
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1. international border: a border between two countries, or the land immediately adjacent to this
  cross the frontier into Spain
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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
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3. limit of knowledge: the furthest limit of knowledge in a specific field
pushing back the frontiers of science
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| [14th century. < Anglo-Norman frounter, French frontière "front part (of an army)" < front (see front)] |
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