auld lang syne From WikiWord, the free dictionary /ˌɔld ˌlæŋ ˈsaɪn/ 🔊 listen English Contents DefinitionsRelated wordsReferences DefinitionsnounDays gone by; former times. Related wordsSynonymsdays of yorebad old daysgood old timesgood old daysold timeforedaybygonebygonesyesterdaychair daysyesteryearoldieyester-yearyesternthing of the pastyear dot References Wiktionary — auld lang syne Wikipedia — auld lang syne