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millennium bug

a bug that can cause computers or software to misinterpret the first two digits of the year 2000 as 19, due to the coding of dates using only the last two digits of the year.
Also called Y2K problem, Y2K bug.
Origin of millennium bug
1990-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for millennium bug

millennium bug

(computing) any software problem arising from the change in date at the start of the 21st century
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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millennium bug in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010
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