unidentified flying object


plural unidentified flying objects
: a mysterious flying object in the sky that is sometimes assumed to be a spaceship from another planet
The Peking Evening News said today that it was swamped with telephone calls from people reporting an "unidentified flying object" over the city. The bright round object spotted yesterday turned out to be a research balloon reflecting the sunlight, the newspaper said.The New York Times

called also UFO

Word History

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of unidentified flying object was in 1947

Dictionary Entries Near unidentified flying object

Cite this Entry

“Unidentified flying object.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unidentified%20flying%20object. Accessed 1 Feb. 2023.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
Name That Thing

You know what it looks like… but what is it called?

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?