光こう年ねんこうねんCommon wordFreq.FrequencyTop 20,000Meanings1nounlight-yearastronomyAstronomical unit of distance; also used figuratively to express a vast gap or difference.アンドロメダ銀ぎん河がは約やく250万にひゃくごじゅう光年まんこうねん先さきにある。The Andromeda Galaxy is about 2.5 million light-years away.彼かれの技ぎ術じゅつは私わたしより