We found 31 dictionaries that define the word proficient:

General (26 matching dictionaries)

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