Definition of auld lang syne noun from the Oxford Advanced American Dictionary

 

auld lang syne

 noun
noun
NAmE//ˌɔld læŋ ˈzaɪn//
 
, NAmE//ˌoʊld‑//
 
 
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an old Scottish song expressing feelings of friendship, traditionally sung at midnight on New Year's Eve
See the Oxford Advanced Learner's Dictionary entry: auld lang syne