昧まい旦たんMeanings1noundawn; daybreakarchaicArchaic literary term for the break of day. In modern Japanese, 夜明け (よあけ) or 明け方 (あけがた) are the standard words.古こ典てんでは「昧まい旦たん」は夜よ明あけを指さす語ごとして使つかわれた。In classical texts, 昧旦 was used as a word for dawn.