/ Dictionary / Index L light line: Meaning and Definition of Find definitions for: light' line" Pronunciation: [key] — Naut. Naut. the line or level to which a ship or boat sinks when fully supplied with fuel and ballast but without cargo. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lightless lightly Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language