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Từ điển WordNet v3.1 - WordNet Dictionary
frontier


noun
1. a wilderness at the edge of a settled area of a country (Freq. 1)
- the individualism of the frontier in Andrew Jackson's day
Hypernyms:
wilderness, wild
2. an international boundary or the area (often fortified) immediately inside the boundary
Hypernyms:
boundary, bound, bounds
Instance Hyponyms:
Triple Frontier
3. an undeveloped field of study;
a topic inviting research and development
- he worked at the frontier of brain science
Hypernyms:
discipline, subject, subject area, subject field, field,
field of study, study, bailiwick

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