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master key

a key that will open a number of different locks, the proper keys of which are not interchangeable.
Origin of master key
1570-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for master key
  • In an individually-keyed padlock system, there is no master key, and all of the locks must be opened with their own key.
  • The contractor shall provide padlocks for each disconnect switch and receptacle box with a master key for all locks.
  • He photocopies it and emails the scan, distributing a master key that can access a whole floor.
  • Using his master key, the officer released the lock.
  • The specific question is in regard to using a master key on a lock when an authorized employee is not on site.
  • The master key may be different in each of the seven state emergency response regions.
  • Rekeying a master key system is a time-consuming, complicated job.
  • Please verify that the contractor is to provide a master key system for new hardware.
  • Creates key code systems and writes high security master key schedules for keys to be cut by facility lock personnel.
  • With one master key, they can gain access to commercial and residential property.
British Dictionary definitions for master key

master key

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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