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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)

1. frontier: Merriam-Webster.com [home, info]
2. frontier: Oxford Learner's Dictionaries [home, info]
3. frontier: American Heritage Dictionary of the English Language [home, info]
4. frontier: Collins English Dictionary [home, info]
5. frontier: Vocabulary.com [home, info]
6. frontier: Macmillan Dictionary [home, info]
7. Frontier, frontier: Wordnik [home, info]
8. frontier: Cambridge Advanced Learner's Dictionary [home, info]
9. Frontier, frontier: Wiktionary [home, info]
10. frontier: Webster's New World College Dictionary, 4th Ed. [home, info]
11. frontier: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. frontier: Infoplease Dictionary [home, info]
13. Frontier, frontier: Dictionary.com [home, info]
14. frontier: Online Etymology Dictionary [home, info]
15. Frontier, frontier: UltraLingua English Dictionary [home, info]
16. frontier: Cambridge Dictionary of American English [home, info]
17. Frontier(s), Frontier (TV series), Frontier (ballet), Frontier (banknotes), Frontier (disambiguation), Frontier (novel), Frontier (pinball), Frontier (supercomputer), Frontier, The Frontier (Chilean History), The Frontier (Hong Kong), The Frontier (novel), The Frontier (website): Wikipedia, the Free Encyclopedia [home, info]
18. Frontier: Online Plain Text English Dictionary [home, info]
19. frontier: Webster's Revised Unabridged, 1913 Edition [home, info]
20. frontier: Rhymezone [home, info]
21. Frontier: AllWords.com Multi-Lingual Dictionary [home, info]
22. frontier: Webster's 1828 Dictionary [home, info]
23. frontier: Free Dictionary [home, info]
24. frontier: Mnemonic Dictionary [home, info]
25. frontier: WordNet 1.7 Vocabulary Helper [home, info]
26. frontier: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. frontier: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

28. FRONTIER: Shakespeare Glossary [home, info]

Business (1 matching dictionary)

29. frontier: Legal dictionary [home, info]

Computing (1 matching dictionary)

30. frontier: Encyclopedia [home, info]

Science (2 matching dictionaries)

31. Frontier: Eric Weisstein's World of Mathematics [home, info]
32. frontier: PlanetMath Encyclopedia [home, info]

Slang (1 matching dictionary)

33. Frontier: Urban Dictionary [home, info]

(Note: See frontiers for more definitions.)

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") ▸ Also see frontiers ▸ Word origin ▸ Words similar to frontier ▸ Usage examples for frontier ▸ Idioms related to frontier (New!) ▸ Popular adjectives describing frontier ▸ Words that often appear near frontier ▸ Rhymes of frontier ▸ Invented words related to frontier