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We found 29 dictionaries with English definitions that include the word proficiency:
Click on the first link on a line below to go directly to a page where "proficiency" is defined.

General (27 matching dictionaries)

1. proficiency: Dictionary/thesaurus [home, info]
2. proficiency: LookWAYup Translating Dictionary/Thesaurus [home, info]
3. proficiency: WordNet 1.7 Vocabulary Helper [home, info]
4. proficiency: Mnemonic Dictionary [home, info]
5. proficiency: Free Dictionary [home, info]
6. proficiency: Webster's 1828 Dictionary [home, info]
7. Proficiency: AllWords.com Multi-Lingual Dictionary [home, info]
8. proficiency: Rhymezone [home, info]
9. Proficiency: Online Plain Text English Dictionary [home, info]
10. Proficiency: Wikipedia, the Free Encyclopedia [home, info]
11. proficiency: Cambridge Dictionary of American English [home, info]
12. proficiency: UltraLingua English Dictionary [home, info]
13. proficiency: Online Etymology Dictionary [home, info]
14. proficiency: Dictionary.com [home, info]
15. proficiency: Infoplease Dictionary [home, info]
16. proficiency: The Wordsmyth English Dictionary-Thesaurus [home, info]
17. proficiency: Wiktionary [home, info]
18. proficiency: Cambridge Advanced Learner's Dictionary [home, info]
19. proficiency, Proficiency: Wordnik [home, info]
20. proficiency: Macmillan Dictionary [home, info]
21. proficiency: Vocabulary.com [home, info]
22. proficiency: Collins English Dictionary [home, info]
23. proficiency: American Heritage Dictionary of the English Language [home, info]
24. proficiency: Oxford Dictionaries [home, info]
25. proficiency: Merriam-Webster.com [home, info]

Business (2 matching dictionaries)

26. proficiency: BusinessDictionary.com [home, info]
27. proficiency: Legal dictionary [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (proficiency) ▸ noun:  the quality of having great facility and competence ▸ noun:  skillfulness in the command of fundamentals deriving from practice and familiarity ("Practice greatly improves proficiency") ▸ Word origin ▸ Words similar to proficiency ▸ Usage examples for proficiency ▸ Popular adjectives describing proficiency ▸ Words that often appear near proficiency ▸ Rhymes of proficiency ▸ Invented words related to proficiency