frontier
Noun
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is a type of: wild, wilderness - a wild and uninhabited area left in its natural condition
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is a type of: bound, boundary, bounds - the line or plane indicating the limit or extent of somethingspecific instances: triple frontier - the border area where Argentina and Brazil and Paraguay meet; an active South American center for contraband and drug trafficking and money laundering; a suspected locale for Islamic extremist groups
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is a type of: bailiwick, discipline, field, field of study, study, subject, subject area, subject field - a branch of knowledge
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