/ Dictionary / Index L lgth.: Meaning and Definition of Find definitions for: lgth. Pronunciation: [key] length. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. l-glucose lg. tn. Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language