Mathematics. Designating a quantity (as a divisor, multiplier, addend, etc.) which belongs equally to two or more other quantities.

(un-, prefix1 affix 1.)

Mathematics. Of a number: that can be expressed as a root of a polynomial in one variable with coefficients that are whole numbers.

(of an integer) equal to the product of a set of different primes; not divisible by a perfect square.

Of a mathematical or physical quantity: (relatively) unaffected in value by variations in some related quantity. Const. to.