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We found 35 dictionaries with English definitions that include the word frontier: Click on the first link on a line below to go directly to a page where "frontier" is defined. General (29 matching dictionaries) frontier: American Heritage Dictionary of the English Language [home, info] frontier: Collins English Dictionary [home, info] frontier: Vocabulary.com [home, info] frontier: Macmillan Dictionary [home, info] frontier: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Frontier, frontier: Wordnik [home, info] frontier: Cambridge Advanced Learner's Dictionary [home, info] Frontier: Wiktionary [home, info] frontier: Compact Oxford English Dictionary [home, info] frontier: Webster's New World College Dictionary, 4th Ed. [home, info] frontier: The Wordsmyth English Dictionary-Thesaurus [home, info] frontier: Infoplease Dictionary [home, info] Frontier, frontier: Dictionary.com [home, info] frontier: Online Etymology Dictionary [home, info] Frontier, frontier: UltraLingua English Dictionary [home, info] frontier: Cambridge Dictionary of American English [home, info] 'Frontier' (elm hybrid), Frontier(s), Frontier (American), Frontier (Code Lyoko episode), Frontier (U.S.), Frontier (album), Frontier (company), Frontier (computer game), Frontier (disambiguation), Frontier (elm hybrid), Frontier (grid computing platform), Frontier (mathematics), Frontier (pinball), Frontier (topology), Frontier, The Frontier (Chilean History), The Frontier (Hong Kong), The Frontier (disambiguation), The Frontier (film), The Frontier (movie), The Frontier: Wikipedia, the Free Encyclopedia [home, info] Frontier: Online Plain Text English Dictionary [home, info] frontier: Webster's Revised Unabridged, 1913 Edition [home, info] frontier: Rhymezone [home, info] Frontier: AllWords.com Multi-Lingual Dictionary [home, info] frontier: Webster's 1828 Dictionary [home, info] frontier: Free Dictionary [home, info] frontier: Mnemonic Dictionary [home, info] frontier: WordNet 1.7 Vocabulary Helper [home, info] frontier: LookWAYup Translating Dictionary/Thesaurus [home, info] frontier: Dictionary/thesaurus [home, info] Art (1 matching dictionary) FRONTIER: Shakespeare Glossary [home, info] Business (1 matching dictionary) frontier: Legal dictionary [home, info] Computing (1 matching dictionary) frontier: Encyclopedia [home, info] Science (2 matching dictionaries) Frontier: Eric Weisstein's World of Mathematics [home, info] frontier: PlanetMath Encyclopedia [home, info] Slang (1 matching dictionary) Frontier: Urban Dictionary [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (frontier) ▸ noun:  an undeveloped field of study; a topic inviting research and development ("He worked at the frontier of brain science") ▸ noun:  an international boundary or the area (often fortified) immediately inside the boundary ▸ noun:  a wilderness at the edge of a settled area of a country ("The individualism of the frontier in Andrew Jackson's day") ▸ Word origin