あさいちばん 朝一番 Common word LinksSentence search for 朝一番Sentence search for あさいちばんKanji details for 朝, 一 and 番Edit in JMdict Noun1. first thing in the morningこのてがみ手紙をあさいちばん朝一番でだ出すのわす忘れないでね。Don't forget to mail this letter first thing in the morning. Discussions Log in to talk about this word.