Y2K Definition
wīto͝o-kā
adjective
Of or relating to the year 2000.
American Heritage
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.
Y2K compliance; Y2K testing.
American Heritage
abbreviation
The year 2000
Webster's New World
Origin of Y2K
Y(ear) 2K informal expression for the number 2000 (using K symbol for 1000)
From American Heritage Dictionary of the English Language, 5th Edition