# Y2K

> English word · Noun · frequency rank #53,346

## Definitions
1. Abbreviation of year 2000.
2. Millennium bug.
3. Millennium bug.

## Etymology
Abbreviated from "year 2000", with "K" standing for 1000, as in the prefix kilo- though capital K as a prefix is often used as ×1024 instead of ×1000. The correct S.I. Prefix for ×1000 is lowercase k.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/y2k