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millennium bug

noun

, Informal.
  1. a bug that could cause computers or software to misinterpret a year after 1999 as having the first two digits 19 instead of 20, due to the coding of dates using only the last two digits of the four-digit year.

millennium bug

noun

  1. computing any software problem arising from the change in date at the start of the 21st century

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Word History and Origins

Origin of millennium bug1

First recorded in 1990–95

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Millennium Bridgemillepede

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