/ Dictionary / Index L lightplane: Meaning and Definition of Find definitions for: light•plane Pronunciation: (līt'plān'), [key] — n. a lightweight passenger airplane with relatively limited performance capability. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. light pipe light pollution 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