夜や行こう性せいTop 20000MeaningsNounNo-adjective1. nocturnality; nocturnal habitsKanji used夜night行go性nature (of a person)Pitch accentやこうせいComposed of夜や行こうnight travel; walking around at night; night trainNoun性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNounExamples1猫ねこは夜や行こう性せいの動どう物ぶつだ。Cats are active at night.