Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to the year 2000.
  • adjective Of or relating to a defect in the code of a computer program caused when a year is represented by its last two digits only and the program interprets that year as falling inclusively between 1900 and 1999 instead of between 2000 and 2099.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun computing : Abbreviation of year 2000.
  • noun computing, by extension Y2K bug

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the year 2000 in the Gregorian calendar

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Y(ear) + 2K, informal expression for the number 2000 (using K, symbol for 1000).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Abbreviated from "year 2000", with "K" standing for 1000, as in the prefix kilo-

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