/ Dictionary / Index L Lockhart: Meaning and Definition of Find definitions for: Lock•hart Pronunciation: (lok'härt, lok'urt), [key] — n. 1794–1854, Scottish biographer and novelist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. locket lock-in 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