/ Dictionary / Index L lifelong: Meaning and Definition of Find definitions for: life•long Pronunciation: (līf'lông", -long"), [key] — adj. lasting or continuing through all or much of one's life: lifelong regret. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lifelong (Thesaurus) lifeline lifemanship Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language