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Index U
- UFO
- UK
- U.K.
- ultra-
- ultraviolet
- UN
- U.N.
- un- (1)
- un- (2)
- unconscious of
- under (1)
- under (2)
- Underground Railroad
- Underground Railway
- under the circumstances
- under the provisions of
- under way
- underway
- under weigh
- undiscriminating
- unexpected surprise
- uni-
- unidentified flying object
- uniform resource locator
- uninterested
- unique
- unique to
- United Kingdom
- United Kingdom of Great Britain and Northern Ireland
- United Nations
- United States
- United States of America
- universal product code
- unlawful
- unsanitary
- unsatisfied
- until
- until such time as
- up
- up-and-coming
- UPC
- upcoming
- upgrade
- upon
- up on
- upper case
- uppercase
- upper-case
- upward
- upwards
- upwards of
- Urdu
- URL
- US
- U.S.
- USA
- U.S.A
- use
- used not to
- used to
- Usher of the Black Rod
- usual custom
- utilize
- UV
- UV index
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unidentified flying object, UFO
The initialism UFO stands for unidentified flying object and is pronounced as its three letters. UFO is written without periods between the letters and is preceded by the article a, not an.
- The pilot reported sighting a UFO over Vegreville.
The plural is UFOs, rarely UFO’s, a spelling that should be reserved for the possessive.
- Does Malcolm truly believe in UFOs?
- The News-Record had a front-page story about the UFO’s arrival.
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