Meaning & use
frontier
A border between two countries, or the outer limit of settled or explored territory.
See it in a sentence
Pioneers pushed westward across the American frontier throughout the nineteenth century.
Researchers described gene editing as an exciting new frontier in medicine.
A note on using this word
Frontier is often used figuratively for the edge of knowledge, as in "the frontier of physics."
Words with a similar meaning
borderboundary
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
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