Ufo definition

yo͝oĕf-ō
Frequency:
An unidentified flying object.
noun
3
1
Any of a number of unidentified objects or phenomena frequently reported, esp. since 1947, to have been observed or tracked in the sky and variously explained as being atmospheric phenomena, hallucinations, misperceptions of actual objects, alien spacecraft, etc.
noun
2
0
A spacecraft from another planet; flying saucer.
noun
2
0
Initialism of unidentified flying object.
noun
0
0
(informal) An alien spacecraft.
noun
0
0
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Alternative Forms

Alternative Form of ufo - unexplained aerial phenomenon

Other Word Forms

Noun

Singular:
ufo
Plural:
ufos