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We found 25 dictionaries with English definitions that include the word master key:
Click on the first link on a line below to go directly to a page where "master key" is defined.

General (22 matching dictionaries)

1. master key: Merriam-Webster.com [home, info]
2. master key: Oxford Learner's Dictionaries [home, info]
3. master key: American Heritage Dictionary of the English Language [home, info]
4. master key: Collins English Dictionary [home, info]
5. master key: Vocabulary.com [home, info]
6. master key: Macmillan Dictionary [home, info]
7. master-key, master key: Wordnik [home, info]
8. master key: Cambridge Advanced Learner's Dictionary [home, info]
9. master key: Wiktionary [home, info]
10. master key: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. master key: Infoplease Dictionary [home, info]
12. Master key, master key: Dictionary.com [home, info]
13. Master Key (TV series), Master key, The Master_Key (disambiguation), The Master_Key (novel), The Master Key: Wikipedia, the Free Encyclopedia [home, info]
14. master key: Rhymezone [home, info]
15. master-key: Webster's 1828 Dictionary [home, info]
16. master key: Free Dictionary [home, info]
17. master key: Mnemonic Dictionary [home, info]
18. master key: WordNet 1.7 Vocabulary Helper [home, info]
19. master key: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. master key: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

21. Master Key: Construction Term Glossary [home, info]

Computing (1 matching dictionary)

22. master key: Encyclopedia [home, info]

Slang (1 matching dictionary)

23. Master Key: Urban Dictionary [home, info]

(Note: See master_keys for more definitions.)

Quick definitions from WordNet (master key) ▸ noun:  key that secures entrance everywhere ▸ Also see master_keys ▸ Words similar to master key ▸ Usage examples for master key ▸ Idioms related to master key (New!) ▸ Words that often appear near master key ▸ Rhymes of master key ▸ Invented words related to master key