frontier
noun
the part of a country that borders another country; boundary; border.
frontiers
-
pluralof frontier.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
AI is the latest chapter in a long history of oil-and-gas engineers expanding the frontiers of exploration and squeezing more hydrocarbons from fields.
From The Wall Street Journal ● Aug. 13, 2026
Terry says Qantas is conquering "one of the last frontiers in commercial aviation".
From BBC ● Jun. 26, 2026
After IBM’s Deep Blue supercomputer scored a landmark victory over chess champion Garry Kasparov in 1997, researchers sought new simulations to push the frontiers of machine intelligence.
From MarketWatch ● May 23, 2026
"This study opens up new frontiers in research on human evolution," adds Professor Eleanor Scerri of the Max Planck Institute of Geoanthropology, also senior author of the study.
From Science Daily ● May 3, 2026
And the other, fainter galaxies must be more distant still, a hundred billion of them, sprinkled through the dark to the frontiers of the known Cosmos.
From "Cosmos" by Carl Sagan
