Word:   
Definitions of frontier:
  • noun:   an undeveloped field of study; a topic inviting research and development
    Example: "He worked at the frontier of brain science"
  • noun:   an international boundary or the area (often fortified) immediately inside the boundary
  • noun:   a wilderness at the edge of a settled area of a country
    Example: "The individualism of the frontier in Andrew Jackson's day"

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See frontier used in context: 135+ rhymes, 2 Shakespeare works, several books and articles.

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