Dictionary
Type a word in English or Spanish. English is blue, Spanish is rose. Tap any line to hear it.
frontier
English
- 🔊 an undeveloped field of study“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”