We found 31 dictionaries that define the word proficient:

General (26 matching dictionaries)

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

Business (1 matching dictionary)

25. proficient: Legal dictionary

Computing (1 matching dictionary)

26. proficient: Encyclopedia

Medicine (1 matching dictionary)

27. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

28. PROFICIENT: Masonic Dictionary

Slang (1 matching dictionary)

29. proficient: Urban Dictionary

(Note: See proficiently as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Good at something; skilled; fluent; practiced, especially in relation to a task or skill. ▸ noun:  An expert. Similar: adept, skilled, expert, practiced, skillful, good, skilful, competent, perficient, sure-handed, more... Opposite: inept, incompetent, ineptitude Types: expert, adept, veteran, master, professional, more... Phrases: more proficient, not proficient, opposite of proficient, highly proficient, to become proficient, more... Adjectives: great, english, meanest, considerable, best, limited, tolerable, least, thorough, wonderful, real Colors:     teal,     emerald,     sapphire,     indigo,     charcoal,     maroon,     burgundy,     olive,     forest green,     royal blue ▸ Words similar to proficient ▸ Usage examples for proficient ▸ Idioms related to proficient ▸ Wikipedia articles (New!) ▸ Popular adjectives describing proficient ▸ Popular nouns described by proficient ▸ Words that often appear near proficient ▸ Rhymes of proficient ▸ Invented words related to proficient