Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “Union Jack”

Union Jack

noun [C]     (also Union flag)
the red, white and blue flag of the United KingdomSpecific signs and symbolsSigns, signals and symbols
(Definition of Union Jack noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “Union Jack” in other dictionaries

Word of the Day

altruistic

showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More