约分 yuēfēn to reduce a fraction Origin Definitions Defs Strokes Stroke Words Sentences Sents 不可约分数 bùkěyuēfēnshù irreducible fraction A fraction that cannot be further simplified because its top and bottom numbers share no common factors other than 1.既约分数 jìyuēfēnshù irreducible fraction a fraction in which the numerator and denominator have no common divisors other than one