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