In mathematics, a constant is a non-varying value, i.e. completely fixed or fixed in the context of use. The term usually occurs in opposition to variable, which is a symbol that stands for a value that may vary.
In Einstein's famous equation
E is energy, m is mass, and c is the constant - specifically, the value for the speed of light in a vacuum. The status of c as a constant dictates that its value cannot be changed.
In polynomials, a second-order polynomial is generally denoted as
where a, b and c are constants called coefficients while x is a variable, as what is usually being studied is how the value of the function varies with x, for given values of a, b and c. The last value, c, is also called the constant term of the polynomial and can be thought of as the coefficient of x0.
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