Usually means: Key that opens multiple locks.
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We found 23 dictionaries that define the word master key:

General (20 matching dictionaries)
  1. master key: Longman Dictionary of Contemporary English
  2. master key: Merriam-Webster
  3. master key: Oxford Learner's Dictionaries
  4. master key: American Heritage Dictionary of the English Language
  5. master key: Collins English Dictionary
  6. master key: Vocabulary.com
  7. master-key, master key: Wordnik
  8. master key: Cambridge Advanced Learner's Dictionary
  9. master key: Wiktionary
  10. master key: The Wordsmyth English Dictionary-Thesaurus
  11. master key: Infoplease Dictionary
  12. Master key, master key: Dictionary.com
  13. Master Key (TV series), Master key, The Master Key (disambiguation), The Master Key (novel), The Master Key: Wikipedia, the Free Encyclopedia
  14. master key: Rhymezone
  15. master-key: Webster's 1828 Dictionary
  16. master key: FreeDictionary.org
  17. master key: Mnemonic Dictionary
  18. master key: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)
  1. master key: Encyclopedia

Slang (1 matching dictionary)
  1. Master Key: Urban Dictionary

(Note: See master_keying as well.)

Definitions from Wiktionary (master key)

noun:  A key designed to open a set of several locks; a passkey.
noun:  (figurative) Any tool or technique that can solve many types of difficulty.
noun:  (law enforcement, slang) A shotgun shell designed for breaching doors.

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