Variable a. : Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.

Variable a. : Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.

Variable n. : That which is variable; that which varies, or is subject to change.

Variable n. : A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.

Variable n. : A shifting wind, or one that varies in force.

Variable n. : Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.

Example:
What is the difference between an independent Variable and a controlled Variable?

Taxonomy
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Defination from the web:
Variable (mathematics), a symbol that stands for a value that may vary. Variable (programming), a symbolic name associated with a value and whose associated value may be changed. A Variable star ... "http://en.wikipedia.org/wiki/Variable" Categories: Disambiguation pages | Variables ...