Usually means: Inform someone about possible danger.
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We found 33 dictionaries that define the word warn:

General (25 matching dictionaries)
  1. warn: Merriam-Webster.com
  2. warn: Oxford Learner's Dictionaries
  3. warn: American Heritage Dictionary of the English Language
  4. warn: Collins English Dictionary
  5. warn: Vocabulary.com
  6. Warn, warn: Wordnik
  7. warn: Cambridge Advanced Learner's Dictionary
  8. Warn, warn: Wiktionary
  9. warn: Webster's New World College Dictionary, 4th Ed.
  10. warn: The Wordsmyth English Dictionary-Thesaurus
  11. warn: Infoplease Dictionary
  12. warn: Dictionary.com
  13. warn: Online Etymology Dictionary
  14. warn: Cambridge Essential American English Dictionary
  15. WARN (FM), WARN, Warn: Wikipedia, the Free Encyclopedia
  16. Warn: Online Plain Text English Dictionary
  17. warn: Webster's Revised Unabridged, 1913 Edition
  18. warn: Rhymezone
  19. warn: AllWords.com Multi-Lingual Dictionary
  20. warn: Webster's 1828 Dictionary
  21. warn: Free Dictionary
  22. warn: Mnemonic Dictionary
  23. warn: Dictionary/thesaurus

Art (2 matching dictionaries)
  1. Technical Glossary of Theatre Terms (No longer online)
  2. Shakespeare Glossary (No longer online)

Business (1 matching dictionary)
  1. warn: Legal dictionary

Computing (1 matching dictionary)
  1. warn: Encyclopedia

Miscellaneous (3 matching dictionaries)
  1. WARN: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. warn: Idioms

Slang (1 matching dictionary)
  1. warn: Urban Dictionary

(Note: See warned as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
verb:  (transitive) To make (someone) aware of (something impending); especially:
verb:  (transitive) To make (someone) aware of impending danger, evil, etc.
verb:  (transitive) To notify or inform (someone, about something).
verb:  (transitive) To summon (someone) to or inform of a formal meeting or duty.
verb:  (transitive, intransitive, of a clock, possibly obsolete) To make a sound (e.g. clicking or whirring) indicating that it is about to strike or chime (an hour).
verb:  (transitive) To caution or admonish (someone) against unwise or unacceptable behaviour.
verb:  (chiefly with "off", "away", and similar words) To advise or order to go or stay away.
verb:  (intransitive) To give warning.
noun:  A surname.

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