What is the meaning of Old lang syne?

See Auld lang syne.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). old lang syne. Retrieved September 28, 2026, from http://smartdefine.org/old_lang_syne/definitions/2038592
ChicagoWebster's. 2011. "old lang syne" http://smartdefine.org/old_lang_syne/definitions/2038592 (accessed September 28, 2026).
HarvardWebster's 2011, old lang syne, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/old_lang_syne/definitions/2038592>.
MLAWebster's. "old lang syne" 27 May 2011. Web. 28 September 2026. <http://smartdefine.org/old_lang_syne/definitions/2038592>