/ Dictionary / Index L LXX: Meaning and Definition of Find definitions for: LXX Pronunciation: [key] Septuagint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lxx (Thesaurus) lx -ly Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language