noun Uncommon

ufo

YOO-foh

Ufo (noun) means an unidentified flying object — something seen in the sky that cannot be readily explained, often associated with claims of alien spacecraft. Example: “Witnesses reported a ufo hovering silently over the field.”

noun

An unidentified flying object — something seen in the sky that cannot be readily explained, often associated with claims of alien spacecraft.

"Witnesses reported a ufo hovering silently over the field."

"The documentary examined dozens of alleged ufo sightings from the 1950s."

How to use ufo

Learner’s notes

In plain EnglishSomething spotted in the sky that people can't identify — sometimes assumed to be an alien craft.

Common pairings

ufo sighting spot a ufo ufo sightings

Word forms

ufos plural

Study it as flashcards or scroll it in Flow — saved to your collection.

Test yourself on “ufo” A quick quiz — meaning, synonyms & usage →

Fill the gap

Can you complete this real example?

Witnesses reported a _____ hovering silently over the field.

Etymology

Reading of UFO as a word in its own right.

Synonyms

View more →

flying saucer unidentified flying object

Related words

spaceship

Frequently asked questions

What does “ufo” mean?

The word “ufo” means an unidentified flying object — something seen in the sky that cannot be readily explained, often associated with claims of alien spacecraft. In plain terms, something spotted in the sky that people can't identify — sometimes assumed to be an alien craft.

How do you pronounce “ufo”?

“Ufo” is pronounced YOO-foh (/ˈju.foʊ/ in IPA).

How do you use “ufo” in a sentence?

Here is “ufo” used in a sentence: “Witnesses reported a ufo hovering silently over the field.”

What part of speech is “ufo”?

“Ufo” is a noun.

Is “ufo” a common word?

“Ufo” is an uncommon word in modern English.

Featured in

Vocabulary lists that include ufo:

Words that end with O Words that start with U

People also searched

spaceship