Definition of auld lang syne noun from the Oxford Advanced Learner's Dictionary

 

auld lang syne

 noun
noun
BrE BrE//ˌɔːld læŋ ˈsaɪn//
 
; NAmE NAmE//ˌɔːld læŋ ˈsaɪn//
 
 
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an old Scottish song expressing feelings of friendship, traditionally sung at midnight on New Year’s Eve Word Origin late 18th cent.: Scots (from Scots auld ‘old’ and archaic Scottish lang syne ‘times gone by’). The phrase was popularized as the title and refrain of a song by Robert Burns (1788).
See the Oxford Advanced American Dictionary entry: auld lang syne