a jack consisting of the union of a national flag or ensign, as the U.S. jack, which has the white stars and blue field of the union of the U.S. national flag.
(often initial capital letter) the British national flag.
any flag the overall design of which is a union.
a common name for Union flag
(often not capitals) a national flag flown at the jackstaff of a vessel
First recorded in 1665–75
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Currently the Senedd flies two Welsh flags and one Union flag - commonly known as the union jack - at the front of the building, alongside the flag of Ukraine.
From BBC • May 22, 2026
People of all ages carried the union jack and took photographs of the King.
From BBC • May 1, 2026
Farron's flag also featured a union jack in one corner.
From BBC • Sep. 20, 2025
For more than a mile, almost every one has a St George's or union jack flag attached - thousands of them.
From BBC • Aug. 23, 2025
Another flag was raised on which were thirteen stripes, in turns red and white, and in the corner the British union jack.
From The Story of Our Country Every Child Can Read by Hurlbut, Jesse Lyman
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
