/ Dictionary / Index L lass: Meaning and Definition of Find definitions for: lass Pronunciation: (las), [key] — n. a girl or young woman, esp. one who is unmarried. a female sweetheart: a young lad and his lass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lass (Thesaurus) La Spezia Lassa Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language