first up From WikiWord, the free dictionary 🔊 listen English Contents DefinitionsRelated wordsReferences Definitionsadverb(sequence) Firstly; before anything else. Related wordsSynonymsfirstfirst of allfirst offfirstlyerst1stlyup frontfirst and foremostfirstableimprimisfor startersforemostlyto begin withforemostfor onepreviously References Wiktionary — first up Wikipedia — first up