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"frontier" - Word "5" letter starting with "A" and ending with "D"
| Definition |
| an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science" |
| an international boundary or the area (often fortified) immediately inside the boundary |
| a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day" |