Word.ws English Dictionary

Y2K

Y2K noun: the millennium bug. Also the abbreviation of the year 2000.

Noun (1)

Y2K (uncountable)

  1. (metonymically) The millennium bug.
    1. (broadly, metonymically) The Y2K scare.

Adjective

Y2K (comparative more Y2K, superlative most Y2K)

  1. (aesthetic) Pertaining to the Y2K aesthetic.
    • Near-synonym: Y2K futurism
    Synonyms:
    Y2K futurism

Noun (2) capitalized: Y2k

Y2k (uncountable)

  1. Alternative letter-case form of Y2K.

Also used as

Y2K is also the abbreviation of the year 2000.

Synonyms of Y2K

Forms of Y2K

Noun
alternative formY2k
Adjective
comparativemore Y2K
superlativemost Y2K

Origin of Y2K

Abbreviated from the year 2000, where K denotes 1,000, derived from the prefix “kilo-.” However, according to the International System of Units (SI), the correct prefix for 1,000 is the lowercase k. The uppercase K is sometimes used informally, particularly in computing contexts, where it may denote 1,024 rather than 1,000.

Words formed from Y2K

Phrases with Y2K

Questions about Y2K

What does Y2K mean?
Y2K means the millennium bug.
What part of speech is Y2K?
Y2K can be a noun or an adjective.

Words near Y2K in the dictionary

  1. y/n
  2. y/o
  3. y/y
  4. Y10K
  5. Y10K bug
  6. Y2K
  7. Y2K aesthetic
  8. Y2K bug
  9. Y2K futurism
  10. Y2K pink
  11. Y2K problem

Source and license

Adapted from Wiktionary: Y2K (page history and authors); Y2k (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “Y2K.” Word.ws, https://word.ws/y2k. Based on Wiktionary, CC BY-SA 4.0.