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