Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

UFO

noun [C]
 
 
/ˌjuː.efˈəʊ/ US  /-ˈoʊ/

Definition

abbreviation for unidentified flying object: an object seen in the sky that is thought to be a spacecraft from another planet: Several UFO sightings have been reported.Space travel
(Definition of UFO noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“UFO” in other dictionaries

Word of the Day

apocryphal

describes a story that is probably not true although often told and believed by some people to have...

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