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From Old French variable, from Latin variare ("to change"), from varius ("different, various").

Full definition of variable

(able to vary) alterable, flexible, changeable, mutable
(likely to vary) fickle, fluctuating, inconstant, shifting, unstable, unsteady
(marked by diversity or difference) varying
(biology: tending to deviate from a normal or recognized type) aberrant

(plural variables)

2013, Katie L. Burke, In the News, Bats host many high-profile viruses that can infect humans, including severe acute respiratory syndrome and Ebola. A recent study explored the ecological variables that may contribute to batsâ€™ propensity to harbor such zoonotic diseases by comparing them with another order of common reservoir hosts: rodents.

There are several variables to consider here.
(mathematics) A quantity that may assume any one of a set of values.
(mathematics) A symbol representing a variable.
(programming) A named memory location in which a program can store intermediate results and from which it can read them.
(astronomy) A variable star.
(nautical) A shifting wind, or one that varies in force.
(nautical, in the plural) Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.

(something that is variable) changeable
(something whose value may be dictated or discovered) parameter
(mathematics: a quantity that may assume any one of a set of values) variable quantity