UFO
noun
ˌyü-(ˌ)ef-ˈō 
ˈyü-(ˌ)fō
plural UFO's or UFOs
ˌyü-(ˌ)ef-ˈōz
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
Carl SaganIn 1966, the first UFO "abduction" was described in journalist John G. Fuller's book The Interrupted Journey.—Keay Davidson
Keay Davidsoncalled also UAP, unidentified aerial phenomenon, unidentified anomalous phenomenon
Examples of UFO in a Sentence
Recent Examples on the Web
The Where in the Woods UFO Stage will move into Centeroo, replacing the Infinity Stage.
—Audrey Gibbs, The Tennessean, 3 Sep. 2025
Just weeks after a previous UFO turned out to be a drifting hot water heater, their second mystery fizzled out just as oddly.
—Neetika Walter, Interesting Engineering, 2 Sep. 2025
While a number of mid-century homes dot the Hudson River commuter towns north of New York City, perhaps none is as playful as comedian Jackie Gleason’s UFO house in Cortlandt Manor.
—Kim Velsey, Curbed, 27 Aug. 2025
Besides Once Upon a Time in Hollywood, Zawierucha is known for Polish films such as Bartkowiak, Porady na Zdrady 2 and Too Old for Fairy Tales 2, and TV shows such as Netflix’s Project UFO and Tajemnice Polskich Fortun and Polsat Box Go’s Domek na Szczescie.
—Jesse Whittock, Deadline, 20 Aug. 2025
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Audrey Gibbs, The Tennessean, 3 Sep. 2025
Just weeks after a previous UFO turned out to be a drifting hot water heater, their second mystery fizzled out just as oddly.
—Neetika Walter, Interesting Engineering, 2 Sep. 2025
While a number of mid-century homes dot the Hudson River commuter towns north of New York City, perhaps none is as playful as comedian Jackie Gleason’s UFO house in Cortlandt Manor.
—Kim Velsey, Curbed, 27 Aug. 2025
Besides Once Upon a Time in Hollywood, Zawierucha is known for Polish films such as Bartkowiak, Porady na Zdrady 2 and Too Old for Fairy Tales 2, and TV shows such as Netflix’s Project UFO and Tajemnice Polskich Fortun and Polsat Box Go’s Domek na Szczescie.
—Jesse Whittock, Deadline, 20 Aug. 2025
See All Example Sentences for UFO
Cite this Entry
“UFO.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/UFO. Accessed 9 Sep. 2025.
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