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fron·tier

frontier

 
 
pronunciation:
fruhn tir
part of speech: noun
definition 1: a border between two countries, or the area nearby on either side.
There is fighting on the frontier between India and Pakistan.
synonyms:
border
similar words:
bound, boundary
definition 2: (sometimes plural) the part of a settlement, exploration, or field of study which is being newly discovered.
These scientists are working on the frontiers of cancer research.Outer space is the final frontier.
synonyms:
border
similar words:
bound, boundary, limits, outpost