/ Dictionary / Index U uranium dating: Meaning and Definition of Find definitions for: ura'nium dat"ing Pronunciation: [key] a method of dating archaeological or geological specimens by determining the decay activity of the uranium in a given sample. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. uranium 239 uranium dioxide Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language