Usually means: Warning of potential or imminent danger.
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We found 46 dictionaries that define the word alert:

General (26 matching dictionaries)
  1. alert: Merriam-Webster.com
  2. alert: Oxford Learner's Dictionaries
  3. alert: American Heritage Dictionary of the English Language
  4. alert: Collins English Dictionary
  5. alert: Vocabulary.com
  6. Alert, alert: Wordnik
  7. alert: Cambridge Advanced Learner's Dictionary
  8. Alert, alert: Wiktionary
  9. alert: Webster's New World College Dictionary, 4th Ed.
  10. alert: The Wordsmyth English Dictionary-Thesaurus
  11. alert: Infoplease Dictionary
  12. ALERT: Dictionary.com
  13. alert: Online Etymology Dictionary
  14. alert: Cambridge Essential American English Dictionary
  15. ALERT (medical facility), Alert(), Alert (gum), Alert (interbank network), Alert: Wikipedia, the Free Encyclopedia
  16. Alert: Online Plain Text English Dictionary
  17. alert: Webster's Revised Unabridged, 1913 Edition
  18. alert: Rhymezone
  19. alert, alert: AllWords.com Multi-Lingual Dictionary
  20. alert: Webster's 1828 Dictionary
  21. Alert: Dictionary of Phrase and Fable (1898)
  22. alert: Free Dictionary
  23. alert: Mnemonic Dictionary
  24. alert: Dictionary/thesaurus

Business (4 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. INVESTORWORDS (No longer online)
  3. alert: Legal dictionary
  4. BusinessDictionary.com (No longer online)

Computing (4 matching dictionaries)
  1. alert: Free On-line Dictionary of Computing
  2. alert: CCI Computer
  3. I T Glossary (No longer online)
  4. alert: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. alert: Medical dictionary
  3. Alert: Brain Injury

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. ALERT: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. alert: Idioms

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

Sports (1 matching dictionary)
  1. Alert: Fifthchair Bridge

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. National Weather Service Glossary (No longer online)

(Note: See alerted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Attentive; awake; on guard.
adjective:  (obsolete) brisk; nimble; moving with celerity.
noun:  An alarm.
noun:  A notification of higher importance than an advisory.
noun:  (military) A state of readiness for potential combat.
noun:  (computing) Synonym of bell (“bell character”).
verb:  To give warning to.
noun:  A community in the Qikiqtaaluk Region, Nunavut, Canada; the northernmost permanently inhabited place in the world.
noun:  An alternative name for Alharod, a village in Varzaqan County, East Azerbaijan Province, Iran.
noun:  An unincorporated community in Jackson Township, Decatur County, Indiana, United States.

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