noun
frontier
FRUHN-teer
noun
1
The border area between two countries, or the edge of settled and unsettled land.
"The town grew up along the old western frontier."
2
The furthest, most advanced edge of knowledge or achievement in a field.
"Scientists are pushing the frontier of what artificial intelligence can do."
How to Use Frontier
Learner’s notesIn plain EnglishA border region, or figuratively, the cutting edge of a field of knowledge.
Common pairings
the final frontier
push the frontier
frontier town
Word Forms
frontiered past tense, frontiers plural, frontiers singular
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The town grew up along the old western _____.
Etymology
From Old French frontiere, based on Latin frons ("front").