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Y2K

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WordReference Random House Unabridged Dictionary of American English © 2026

Y2K n.

the year 2000.
Also called Y2K problem. See millennium bug (in this section).

Y(ear) + 2 + K symbol for the number 1000 1995–2000

Collins Concise English Dictionary © HarperCollins Publishers::

Y2K n informal

another name for the year 2000 ad (esp referring to the millennium bug)

Etymology: 20th Century: y( ear) + 2 + k (in the sense: thousand)

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