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Y2K

[wahy-too-key]
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noun
  1. the year 2000.
  2. Also called Y2K problem, Y2K bug. millennium bug.
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Origin of Y2K

1995–2000; Y(ear) + 2 + K symbol for the number 1000
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for y2k

Y2K

noun informal
  1. another name for the year 2000 ad (esp referring to the millennium bug)
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Word Origin

C20: y (ear) + 2 + k (in the sense: thousand)
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