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We found 34 dictionaries with English definitions that include the word proficient:
Click on the first link on a line below to go directly to a page where "proficient" is defined.

General (29 matching dictionaries)

1. proficient: Merriam-Webster.com [home, info]
2. proficient: Oxford Learner's Dictionaries [home, info]
3. proficient: American Heritage Dictionary of the English Language [home, info]
4. proficient: Collins English Dictionary [home, info]
5. proficient: Vocabulary.com [home, info]
6. proficient: Macmillan Dictionary [home, info]
7. Proficient, proficient: Wordnik [home, info]
8. proficient: Cambridge Advanced Learner's Dictionary [home, info]
9. proficient: Wiktionary [home, info]
10. proficient: Webster's New World College Dictionary, 4th Ed. [home, info]
11. proficient: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. proficient: Infoplease Dictionary [home, info]
13. Proficient, proficient: Dictionary.com [home, info]
14. proficient: UltraLingua English Dictionary [home, info]
15. proficient: Cambridge Dictionary of American English [home, info]
16. Proficient: Wikipedia, the Free Encyclopedia [home, info]
17. Proficient: Online Plain Text English Dictionary [home, info]
18. proficient: Webster's Revised Unabridged, 1913 Edition [home, info]
19. proficient: Rhymezone [home, info]
20. proficient: AllWords.com Multi-Lingual Dictionary [home, info]
21. proficient: Webster's 1828 Dictionary [home, info]
22. proficient: Free Dictionary [home, info]
23. proficient: Mnemonic Dictionary [home, info]
24. proficient: WordNet 1.7 Vocabulary Helper [home, info]
25. proficient: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. proficient: Dictionary/thesaurus [home, info]
27. proficient: Wikimedia Commons US English Pronunciations [home, info]

Business (1 matching dictionary)

28. proficient: Legal dictionary [home, info]

Computing (1 matching dictionary)

29. proficient: Encyclopedia [home, info]

Medicine (1 matching dictionary)

30. proficient: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

31. PROFICIENT: Masonic Dictionary [home, info]

Slang (1 matching dictionary)

32. proficient: Urban Dictionary [home, info]

(Note: See proficients for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (proficient) ▸ adjective:  having or showing knowledge and skill and aptitude ("A proficient engineer") ▸ Also see proficients ▸ Words similar to proficient ▸ Usage examples for proficient ▸ Idioms related to proficient (New!) ▸ Popular nouns described by proficient ▸ Words that often appear near proficient ▸ Rhymes of proficient ▸ Invented words related to proficient