# Union Jack

> English word · Noun

## Definitions
1. The flag of the United Kingdom, consisting of the flags of England (St. George's Cross), Scotland (St. Andrew's Cross), and Ireland (St. Patrick's Cross, now only used in Northern Ireland) combined.
2. The British Empire.
3. The flag, consisting of the flags of England, Scotland, and Northern Ireland combined, flown on ships of the government of the United Kingdom.
4. The flag, consisting of the blue star-studded field in the corner of the national ensign, flown at the jackstaff by ships at anchor.

## Etymology
From union + jack (“ship’s flag”).

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