Vocabulary What does 公明正大 (こうめいせいだい) mean? 公明正大 (こうめいせいだい) means fair, open and above board (lit. open, clear and upright). Quick factsReadingこうめいせいだい 公明正大こうめいせいだいTOPICSfair, open and above board (lit. open, clear and upright)Example sentences選考(せんこう)は公明正大(こうめいせいだい)に行(おこな)われるべきだ。The selection ought to be carried out fairly and openly.Kanji in this word公public, official; shared明bright, clear正correct, right, honest; accurate大big, large