\ ˌyü-(ˌ)ef-ˈō
, ˈyü-(ˌ)fō \
, ˈyü-(ˌ)fō \
plural UFO's or UFOs\
ˌyü-(ˌ)ef-ˈōz
, ˈyü-(ˌ)fōz
\
, ˈyü-(ˌ)fōz
\
Definition of UFO
: 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
Learn More About UFO
Statistics for UFO
Look-up Popularity
Cite this Entry
“UFO.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/UFO. Accessed 8 Jul. 2022.
Style: MLA
MLA
Chicago
APA
Merriam-Webster
Chicago
APA
Merriam-Webster
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?
Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
-
Wild Words from the Animal Kingdom
Find out if you are vulpine or asinine
Take the quiz
-
Brand Name Vocabulary Quiz
You’re gonna need some moxie to ace this quiz
Take the quiz
-
Name That Thing
Test your visual vocabulary with our 10-question ...
Take the quiz
-
Spelling Bee Quiz
Can you outdo past winners of the National Spelli...
Take the quiz
Share UFO
Time Traveler for UFO
The first known use of UFO was in 1953
See more words from the same year