/ Dictionary / Index U unidentified flying object: Meaning and Definition of Find definitions for: uniden'tified fly'ing ob'ject. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unicycle unidimensional Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language