既約 きやく Meanings な-adjective, の-adjective, Noun irreducible Kanji 既 already. Read as キ. 約 promise. Read as ヤク. Words containing 既約 既約分数 (きやくぶんすう) irreducible fraction 一粒子既約 (いちりゅうしきやく) one particle irreducible 既約表現 (きやくひょうげん) irreducible representation Word lists Mathematics Jinuma: Japanese Dictionary · Word lists