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master key

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noun
  1. a key that will open a number of different locks, the proper keys of which are not interchangeable.
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Origin of master key

First recorded in 1570–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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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 interchangeableAlso called: pass key
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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