auld lang syne (ôld? l?ng z?n?, s?n?)n. The times gone past; the good old days.[Scots : auld, old + lang, long + syne, since.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.auld lang syne (???ld læ? ?s??n; ?sa?n; ?za?n) nold times; times past, esp those remembered with affection or nostalgia[Scottish, literally: old long since]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014auld lang syne (??ld læ? ?za?n, ?sa?n) n. fondly remembered times. [Scot: literally, old long since, i.e., old long-ago (days)] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.