American Heritage® Dictionary of the English Language, Fourth Edition
- n. A key that opens every one of a given set of locks. Also called passkey.
Century Dictionary and Cyclopedia
- n. A key which opens (masters) many locks so differently constructed that the key proper to each will open none of the others.
- n. Figuratively, a general clue to lead out of many difficulties; a guide to the solution of many questions or doubts.
GNU Webster's 1913
- n. a key adapted to open several locks differing somewhat from each other; figuratively, a rule or principle of general application in solving difficulties.
- n. key that secures entrance everywhere
“Using a master key I discovered on the ring l'd taken from Graffius, I conducted a fruitless search of each room.”
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