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In mathematics, value may refer to several, strongly related notions.

In general, a mathematical value may be any definite mathematical object. In elementary mathematics, this is most often a number – for example, a real number such as π or an integer such as 42.

The value of a variable or a constant is any number or other mathematical object assigned to it.
The value of a mathematical expression is the result of the computation described by this expression when the variables and constants in it are assigned values.
The value of a function, given the value(s) assigned to its argument(s), is the quantity assumed by the function for these argument values.

For example, if the function f is defined by f(x) = 2x2 – 3x + 1, then assigning the value 3 to its argument x yields the function value 10, since f(3) = 2·32 – 3·3 + 1 = 10.

If the variable, expression or function only assumes real values, it is called real-valued. Likewise, a complex-valued variable, expression or function only assumes complex values.

Value function
Value (computer science)
Absolute value
Truth value

References

http://mathworld.wolfram.com/Value.html
Meschkowski, Herbert (1968). Introduction to Modern Mathematics. George G. Harrap & Co. Ltd. p. 32. ISBN 0245591095.

Mathematics Encyclopedia