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Definition: in mathematics, a number or other fixed quantity applied to a variable. The value of an expression will depend on the numbers which are substituted for the variables.
Source: Hutchinson Pocket Dictionary of Maths. Abingdon, Oxfordshire, GBR: Helicon Publishing, 2005. p 143.
Example: For example, x^2 + y^2 has the value 25 when x = 3 and y = 4.