/ Dictionary / Index F first lieutenant: Meaning and Definition of Find definitions for: first' lieuten'ant Pronunciation: [key] — Mil. Mil. an officer ranking next above second lieutenant and next below a captain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. first lien first light Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language