We found 23 dictionaries that define the word mastering:

General (15 matching dictionaries)

1. mastering: Merriam-Webster
2. mastering: Collins English Dictionary
3. mastering: Vocabulary.com
4. Mastering, mastering: Wordnik
5. mastering: Cambridge Advanced Learner's Dictionary
6. mastering: Wiktionary
7. Mastering, mastering: Dictionary.com
8. mastering: Cambridge Essential American English Dictionary
9. Mastering (audio), Mastering: Wikipedia, the Free Encyclopedia
10. Mastering: Online Plain Text English Dictionary
11. mastering: Rhymezone
12. Mastering: AllWords.com Multi-Lingual Dictionary
13. mastering: FreeDictionary.org
14. mastering: Mnemonic Dictionary
15. mastering: TheFreeDictionary.com

Business (2 matching dictionaries)

16. mastering: Legal dictionary
17. mastering: Financial dictionary

Computing (1 matching dictionary)

18. mastering: Encyclopedia

Medicine (1 matching dictionary)

19. mastering: Medical dictionary

Miscellaneous (1 matching dictionary)

20. mastering: Idioms

Slang (1 matching dictionary)

21. mastering: Urban Dictionary

Tech (2 matching dictionaries)

22. Rane Professional Audio Reference (No longer online)
23. Sweetwater Music (No longer online)

(Note: See master as well.)

Definitions from Wiktionary (mastering) ▸ noun:  Becoming professional in the use of something; having mastery of. ▸ noun:  The process by which an audio recording is mastered. Similar: headmaster, schoolmaster, maestro, captain, sea captain, lord, overlord, professional, dominate, master copy, more... Opposite: struggling, failing, floundering, stumbling, unskilled Types: brickwall, loudness, dynamic range, dynamic compression, dynamic limiting, dynamic expansion, dynamic EQ, more... Phrases: bus mastering, audio mastering, Mastering the Art of French Cooking, Direct metal mastering, Mastering engineer, more... Adjectives: worth, school, successful, over, final, thorough, gradual, digital, pre, long, practical Colors:     gold,     silver,     black,     white,     royal blue, more... ▸ Words similar to mastering ▸ Usage examples for mastering ▸ Idioms related to mastering ▸ Wikipedia articles (New!) ▸ Popular adjectives describing mastering ▸ Words that often appear near mastering ▸ Rhymes of mastering ▸ Invented words related to mastering