/ Dictionary / Index U usu.: Meaning and Definition of Find definitions for: usu. Pronunciation: [key] usual. usually. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ustulation usual Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language