variableとは何ですか? variableとは何ですか? Likely to change or vary; subject to variation; changeable.Inconstant; fickle.Biology Tending to deviate, as from a normal or recognized type; aberrant.Mathematics Having no fixed quantitative value.Something that varies or is prone to variation.Astronomy A variable star.Mathematics A quantity capable of assuming any of a set of values.Mathematics A symbol representing such a quantity. For example, in the expression a2 + b2 = c2, a, b, and c are variables.