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.
—Melonee Hurt, USA Today, 18 July 2025
Overall, Dan Da Dan is a fun send-up of UFO and supernatural pop-culture, and also cements that with likeable leads.
—Ollie Barder, Forbes.com, 13 July 2025
The resulting mix of mystery and mass panic would spawn a worldwide craze, leading to countless UFO reports, hoaxes and sci-fi depictions.
—Mike Bezemek, Smithsonian Magazine, 10 July 2025
New York state has seen 66 reported Unidentified Aerial Phenomena (UAP) sightings during the first half of 2025, according to a report from the National UFO Reporting Center (NUFORC).
—Sarah Rumpf-Whitten, FOXNews.com, 7 July 2025
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Melonee Hurt, USA Today, 18 July 2025
Overall, Dan Da Dan is a fun send-up of UFO and supernatural pop-culture, and also cements that with likeable leads.
—Ollie Barder, Forbes.com, 13 July 2025
The resulting mix of mystery and mass panic would spawn a worldwide craze, leading to countless UFO reports, hoaxes and sci-fi depictions.
—Mike Bezemek, Smithsonian Magazine, 10 July 2025
New York state has seen 66 reported Unidentified Aerial Phenomena (UAP) sightings during the first half of 2025, according to a report from the National UFO Reporting Center (NUFORC).
—Sarah Rumpf-Whitten, FOXNews.com, 7 July 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 25 Jul. 2025.
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