Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "frontiers" in a sentence
"What happens outside our frontiers is at least as important as what happens within them."
"The idea of open and closed frontiers is Giliomee's, articulated in "Processes in Development of the Southern African Frontier," in Lamar and Thompson, 76 – 119."
"Allying with Nanzhao, Tibetan cavalry challenged Tang China's long frontiers from the southwest to the northwest."