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combination lock

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combination lock

–noun
a lock opened by rotating one or more specially marked dials a given number of times through a particular set of positions in a prescribed order and direction.

Origin:
1850–55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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combination lock  
n.  A lock that will open only when its dial is turned through a predetermined sequence of positions identified on the dial face by numbers or letters.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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