U u


    • US Pronunciation
    • US IPA
    • [yoo-ef-oh or, sometimes, yoo-foh]
    • /ˈyuˈɛfˈoʊ or, sometimes, ˈyu foʊ/
    • US Pronunciation
    • US IPA
    • [yoo-ef-oh or, sometimes, yoo-foh]
    • /ˈyuˈɛfˈoʊ or, sometimes, ˈyu foʊ/

Definitions of ufo word

  • noun plural ufo any unexplained moving object observed in the sky, especially one assumed by some observers to be of extraterrestrial origin. 1
  • noun Definition of ufo in Technology (language)   (United Functions and Objects) A hybrid functional and object-oriented language designed by John Seargant at Manchester University for general-purpose parallel computation. To a first approximation, UFO is a strict, higher-order functional language with an object-oriented type system, and strong support for numeric computation in the form of SISAL-style arrays and loops. Parallelism is implicit, and applies at various different levels of granularity, thereby facilitating implementations on a wide range of parallel architectures. It is planned to run it on a 64 processor KSR machine. 1
  • countable noun ufo A UFO is an object seen in the sky or landing on Earth which cannot be identified and which is often believed to be from another planet. UFO is an abbreviation for 'unidentified flying object'. 0
  • abbreviation UFO unidentified flying object 0
  • noun ufo any of a number of unidentified objects or phenomena frequently reported, esp. since 1947, to have been observed or tracked in the sky and variously explained as being atmospheric phenomena, hallucinations, misperceptions of actual objects, alien spacecraft, etc. 0
  • noun ufo a spacecraft from another planet; flying saucer 0

Information block about the term

Origin of ufo

First appearance:

before 1950
One of the 5% newest English words
1950-55; u(nidentified) f(lying) o(bject)

Historical Comparancy

Parts of speech for Ufo


ufo popularity

A common word. It’s meaning is known to most children of preschool age. About 79% of English native speakers know the meaning and use the word.
Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

ufo usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for ufo

noun ufo

  • aircraft — An aircraft is a vehicle which can fly, for example an aeroplane or a helicopter.
  • airliner — An airliner is a large aeroplane that is used for carrying passengers.
  • airship — An airship is an aircraft that consists of a large balloon which is filled with gas and is powered by an engine. It has a section underneath for passengers.
  • flying saucer — any of various disk-shaped objects allegedly seen flying at high speeds and altitudes, often with extreme changes in speed and direction, and thought by some to be manned by intelligent beings from outer space.

Top questions with ufo

  • what does ufo stand for?
  • what is a ufo?
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  • how to make ufo in little alchemy?
  • what does ufo mean?
  • how to draw a ufo?
  • why did the flying saucer have ufo printed on it?

See also

Matching words

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