Usually means: Unidentified flying object, mysterious sightings.
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We found 40 dictionaries that define the word UFO:

General (23 matching dictionaries)
  1. ufo: Longman Dictionary of Contemporary English
  2. UFO, UFO: Merriam-Webster
  3. UFO: Oxford Learner's Dictionaries
  4. UFO: American Heritage Dictionary of the English Language
  5. UFO: Collins English Dictionary
  6. UFO: Vocabulary.com
  7. Ufo, ufo: Wordnik
  8. UFO, ufo: Cambridge Advanced Learner's Dictionary
  9. UFO, ufo: Wiktionary
  10. UFO: Webster's New World College Dictionary, 4th Ed.
  11. UFO: The Wordsmyth English Dictionary-Thesaurus
  12. UFO: Infoplease Dictionary
  13. UFO: Dictionary.com
  14. UFO: Online Etymology Dictionary
  15. ufo: Cambridge Essential American English Dictionary
  16. U.F.O, U.F.O. (Coldplay song), U.F.O. (band), UFO (Daugherty), UFO (Michael Daugherty composition), UFO (Pink Lady song), UFO (R&B group), UFO (Sneaky Sound System song), UFO (TV series), UFO (band), UFO (disambiguation), UFO (musician), UFO (restaurant), UFO (ride), UFO (satellite), UFO, Ufo (genus), Ufo: Wikipedia, the Free Encyclopedia
  17. Ufo: Rhymezone
  18. UFO: Stammtisch Beau Fleuve Acronyms
  19. ufo: FreeDictionary.org
  20. ufo: Mnemonic Dictionary
  21. UFO: TheFreeDictionary.com

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

Computing (3 matching dictionaries)
  1. UFO: Free On-line Dictionary of Computing
  2. UFO, UFO: Dictionary of Programming Languages
  3. U.F.O, UFO: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (7 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. UFO: Acronym Finder
  3. UFO: Three Letter Words with definitions
  4. UFO [Unidentified Flying Object]: The Skeptic's Dictionary
  5. AbbreviationZ (No longer online)
  6. UFO: Wordcraft Dictionary
  7. Third Eye's Paranormal (No longer online)

Religion (1 matching dictionary)
  1. Religious Tolerance (No longer online)

Science (1 matching dictionary)
  1. UFO: Cytokines & Cells Online Pathfinder Encyclopaedia

Slang (2 matching dictionaries)
  1. UFO (offensive): Racial Slur Database
  2. The UFO, U.F.O, U.F.O, UFO: Urban Dictionary

Tech (1 matching dictionary)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

(Note: See ufo's as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (colloquial) An "unfinished object" in knitting or other kinds of craft.
noun:  A UFO.
noun:  Initialism of unidentified flying object; (loosely) an alien spacecraft. [Anything not readily explainable appearing to move through or be suspended in the air, primarily used to refer to objects that seem to be at least of small and familiar aircraft size.]
noun:  (astronomy) Initialism of ultrared flattened object.

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IFO

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Similar:

Opposite:
IFO

Types:

Phrases:

Adjectives:

Colors:
    green,     silver,     black,     gray,     neon green, more...



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