Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
frontier | Yes | No | No | No |
Triple Frontier | Yes | No | No | No |
frontier (noun) | Triple Frontier (noun) |
---|---|
an undeveloped field of study; a topic inviting research and development | 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 |
a wilderness at the edge of a settled area of a country | |
an international boundary or the area (often fortified) immediately inside the boundary |