Able to vary or be varied.
variable winds or seasons; a variable quantity; a variable resistor
Marked by diversity or difference.
Something that is variable.
Borrowed into Middle English in the 14th century from Old French variable, from Latin variare (“to change”), from varius (“different, various”). Equates to English vary + -able.
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Something whose value may be dictated or discovered.
There are several variables to consider here.
A quantity that may assume any one of a set of values.