UFO

noun

ˌyü-(ˌ)ef-ˈō How to pronounce UFO (audio)
ˈyü-(ˌ)fō
plural UFO's or UFOs ˌyü-(ˌ)ef-ˈōz How to pronounce UFO (audio)
ˈyü-(ˌ)fōz
: a mysterious flying object in the sky that is sometimes assumed to be a spaceship from another planet : unidentified flying object
"All right." The President sighed. "Is there anybody around this table who thinks UFOs and this signal from Vega have anything to do with each other?"Carl Sagan
In 1966, the first UFO "abduction" was described in journalist John G. Fuller's book The Interrupted Journey.Keay Davidson

called also UAP, unidentified aerial phenomenon, unidentified anomalous phenomenon

Examples of UFO in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Today, he’s built a brand as a go-to name for debunking UFO sightings and conspiracies. Stephen Pastis, Forbes, 20 Dec. 2024 That endorsement never came, though an agency report endorsed the idea of an app for collecting UFO sightings. Noah Shachtman, Rolling Stone, 19 Dec. 2024 One of Kreskin’s less successful stunts was his 2002 guarantee that a UFO would appear over Las Vegas on June 2. Brian Niemietz, New York Daily News, 11 Dec. 2024 In November, the Pentagon released a new report stating that hundreds of UFO sightings were actually balloons, birds and satellites, or other explainable phenomena. Paul Du Quenoy, Newsweek, 9 Dec. 2024 See all Example Sentences for UFO 

Word History

Etymology

unidentified flying object

First Known Use

1953, in the meaning defined above

Time Traveler
The first known use of UFO was in 1953

Dictionary Entries Near UFO

Cite this Entry

“UFO.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/UFO. Accessed 5 Jan. 2025.

Kids Definition

plural UFO's or UFOs -ˈōz How to pronounce UFO (audio)
: an unidentified flying object
especially : flying saucer

More from Merriam-Webster on UFO

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