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Definition: in mathematics, a changing quantity (one that can take various values), as opposed to a constant.
Source: Helicon Publishing. Hutchinson Pocket Dictionary of Maths. Abingdon, Oxfordshire, GBR: Helicon Publishing, 2005. p 144.
Example: For example, in the algebraic expression y = (4(x^3)) + 2, the variables are x and y, whereas 4 and 2 are constants.