| 1. frontier | |
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A wilderness at the edge of a settled area of a country
"the individualism of the frontier in Andrew Jackson's day";
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سرحد۔ |
| 2. frontier | |
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An international boundary or the area (often fortified) immediately inside the boundary
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| 3. frontier | |
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An undeveloped field of study; a topic inviting research and development
"he worked at the frontier of brain science";
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