Usually means: Flag of the United Kingdom.
Definitions Related words Phrases Mentions
We found 27 dictionaries that define the word Union Jack:

General (21 matching dictionaries)
  1. union jack: Longman Dictionary of Contemporary English
  2. union jack, the Union Jack, the union jack: Merriam-Webster
  3. Union Jack, union jack: Oxford Learner's Dictionaries
  4. union jack: American Heritage Dictionary of the English Language
  5. Union Jack: Collins English Dictionary
  6. Union Jack: Vocabulary.com
  7. Union Jack, union-jack: Wordnik
  8. Union Jack, Union jack: Cambridge Advanced Learner's Dictionary
  9. Union Jack: Wiktionary
  10. union jack: The Wordsmyth English Dictionary-Thesaurus
  11. union jack: Infoplease Dictionary
  12. union jack: Dictionary.com
  13. Union Jack: Online Etymology Dictionary
  14. The Union Jack, Union Jack (American newspaper), Union Jack (James Montgomery Falsworth), Union Jack (Joseph Chapman), Union Jack (ballet), Union Jack (band), Union Jack (comics), Union Jack (disambiguation), Union Jack (magazine), Union Jack, Union jack: Wikipedia, the Free Encyclopedia
  15. Union jack: Rhymezone
  16. Union Jack: Dictionary of Phrase and Fable (1898)
  17. union jack: FreeDictionary.org
  18. union jack: Mnemonic Dictionary
  19. union jack: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Travel Industry Dictionary (No longer online)

Computing (1 matching dictionary)
  1. Union Jack: Encyclopedia

Slang (2 matching dictionaries)
  1. union jack, union jack: Green’s Dictionary of Slang
  2. The Union Jack: Urban Dictionary

Tech (1 matching dictionary)
  1. SeaTalk Dictionary of English Nautical Language (No longer online)

(Note: See union_jacks as well.)

Definitions from Wiktionary (Union Jack)

noun:  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.
noun:  (by extension) The British Empire.
noun:  (nautical, British) The flag, consisting of the flags of England, Scotland, and Northern Ireland combined, flown on ships of the government of the United Kingdom.
noun:  (nautical, US) The flag, consisting of the blue star-studded field in the corner of the national ensign, flown at the jackstaff by ships at anchor.

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