Ufo

//ˌjuˌɛfˈoʊ// noun, slang

noun, slang ·Moderate ·High school level

Definitions

Noun
  1. 1
    Initialism of unidentified flying object; (loosely) an alien spacecraft. abbreviation, alt-of, initialism

    "After the case had been reported in the newspapers, Mrs. Gracindo de Souza, wife of a member of the local stock exchange, told police that she and her daughter had been driving down Alameda Sao Boaventura when they had seen an^([sic]) UFO hovering over the clearing where the bodies were later discovered."

  2. 2
    A UFO.
  3. 3
    an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins wordnet
  4. 4
    An "unfinished object" in knitting or other kinds of craft. colloquial

    "UFOs differ from WIPs in that a WIP is a project one is actively pursuing, while a UFO runs the risk of never getting finished."

  5. 5
    Initialism of ultrared flattened object. abbreviation, alt-of, initialism

Synonyms

All synonyms
fastwalkerflying saucerflying sauceruapunidentified aerial phenomenonunidentified flying object

Antonyms

All antonyms
saucer

Example

More examples

"The pilot hinted that it might be a UFO."

Etymology

Etymology 1

Abbreviations.

Etymology 2

Reading of UFO as a word in its own right.

Related phrases

UFO nestUFO peachUFO religionflying saucer

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.