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fron·tier

frontier

 
 
pronunciation:
fruhn tir
part of speech: noun
definition 1: A frontier is a border between two countries, or the area near the border on either side.
We're high in the mountains now and the train will be crossing the frontier between the two countries very soon.
synonyms:
border
similar words:
boundary
definition 2: The frontier in a country is the land that is the farthest away from where most of the people of a country live. The frontier is the land that has not been explored very much or settled by many people. "The frontier" or "the frontiers" can also mean an area of science or knowledge that is just beginning to be studied or understood.
Explorers went to see what was out there in the wild frontier.These scientists are working on the frontiers of research into this disease.
synonyms:
border
similar words:
boundary, limits