FRONTIER

Definition:

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

Synonyms:

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Related Words:

• Triple Frontier