2. Noun. (mathematics) the ratio of two homogeneous polynomials, such that the sum of the exponents in a term of the numerator is equal to the sum of the exponents in a term of the denominator. ¹
3. Noun. (mathematics) a function ''f''(''x'') which has the property that for any ''c'', . ¹
¹ Source: wiktionary.com