/ Dictionary / Index L langsyne: Meaning and Definition of Find definitions for: lang•syne Pronunciation: (lang"zīn', -sīn'), [key] — Scot. Scot. —adv. long since; long ago. —n. time long past. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: langsyne (Thesaurus) Langston Langton Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language