Dictionary/虚空こくうKokuu虚空 (Kokuu) is a Japanese noun meaning “empty space, empty sky”.Meaningsnounempty space; empty skyKanji in 虚空虚void空emptyRelated words開くto open (e.g. doors)空emptiness空sky開けるto open (a door, etc.)空くto become less crowded空気air空港airport空間space空っぽempty夜空night sky空き巣empty nest虚しいempty