noun Download 🔗Share The part of a country which borders or faces another country or unsettled region Examples : ""The soldiers guarded the country's frontiers against any possible invasion from neighboring nations." " geography nation area politics state Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The most advanced or recent version of something; leading edge. Examples : "the frontier of civilization" technology science achievement Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share An outwork of a fortification. Examples : "The soldiers patrolled the frontiers of the castle's outer wall, watching for enemy movements. " military architecture war Chat with AIVocabulary GamePractice Reading