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QR code

a matrix bar code that is read by photographing it with the camera of a smartphone or other mobile device that is equipped with a bar-code reader:
Scan the QR code in our print ads to link to special offers on our website.
Origin of QR code
1990-95; abbreviation of quick-response code Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for QR code

QR Code

trademark a type of bar code that can be read both horizontally and vertically, allowing large amounts of information to be encoded in it
Word Origin
C20: Q(uick) R(esponse)
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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