able or apt to vary; subject to variation or changes
said of the wind: liable to change in strength and direction
said of behaviour, etc: fickle or inconstant
said of a quantity: able to assume any of a range of values
said of a biological group or character: deviating or liable to deviate from its true type; aberrant
said of an electrical device, etc: allowing some property to be varied
variability /-ʹbiliti/ noun
variableness noun
variably adv