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master key

noun
1.
a key that will open a number of different locks, the proper keys of which are not interchangeable.
Origin
1570-1580
1570-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for master-key

master key

noun
1.
a key that opens all the locks of a set, the individual keys of which are not interchangeable Also called pass key
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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