/ Dictionary / Index L lain: Meaning and Definition of Find definitions for: lain Pronunciation: (lān), [key] — v. pp. of. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lain (Thesaurus) laigh Laing Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language