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say it: fruhn-TIR
frontier is a noun meaning "a wilderness at the edge of a settled area of a country". It is pronounced /fɹənˈtɪɹ/ — fruhn-TIR. It carries 3 recorded senses.
a wilderness at the edge of a settled area of a country
“the individualism of the frontier in Andrew Jackson's day”
an international boundary or the area (often fortified) immediately inside the boundary
an undeveloped field of study; a topic inviting research and development
“he worked at the frontier of brain science”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for frontier come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.