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 firsthand report describes a retaliatory alien attack after Soviet soldiers reportedly shot down a UFO flying over a military base.
—Julia Bonavita, FOXNews.com, 13 Apr. 2025
The likes of Neva and UFO 50 followed suit, carving a place amongst the likes of the Silent Hill 2 remake and Astro Bot as titles that managed to maintain players and critics’ attention even in a crowded end of year pileup.
—Diego Argüello, Rolling Stone, 12 Apr. 2025
And of course, there’s talk of Area 51, a remote, formerly top-secret U.S. military base that has long been the subject of UFO and space alien lore.
—Stephanie Nolasco, FOXNews.com, 4 Apr. 2025
Watch the Skies, which debuted in its home country back in 2022 as UFO Sweden, follows a teenager searching for her missing (and possibly abducted by aliens) father with a UFO watchers' club.
—New Atlas, 29 Mar. 2025
See All Example Sentences for UFO
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Julia Bonavita, FOXNews.com, 13 Apr. 2025
The likes of Neva and UFO 50 followed suit, carving a place amongst the likes of the Silent Hill 2 remake and Astro Bot as titles that managed to maintain players and critics’ attention even in a crowded end of year pileup.
—Diego Argüello, Rolling Stone, 12 Apr. 2025
And of course, there’s talk of Area 51, a remote, formerly top-secret U.S. military base that has long been the subject of UFO and space alien lore.
—Stephanie Nolasco, FOXNews.com, 4 Apr. 2025
Watch the Skies, which debuted in its home country back in 2022 as UFO Sweden, follows a teenager searching for her missing (and possibly abducted by aliens) father with a UFO watchers' club.
—New Atlas, 29 Mar. 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 21 Apr. 2025.
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