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Definition of variable
1not consistent or having a fixed pattern; liable to change:the quality of hospital food is highly variable awards can be for variable amounts (of a wind) tending to change direction. Mathematics (of a quantity) able to assume different numerical values. Botany
& Zoology (of a species) liable to deviate from the typical color or form, or to occur in different colors or forms.
2able to be changed or adapted:the drill has variable speed (of a gear) designed to give varying ratios or speeds.
an element, feature, or factor that is liable to vary or change:there are too many variables involved to make any meaningful predictions Mathematics a quantity that during a calculation is assumed to vary or be capable of varying in value. Computing a data item that may take on more than one value during the runtime of a program.
) the region of light, variable winds to the north of the northeast trade winds or (in the southern hemisphere) between the southeast trade winds and the westerlies.