This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality, state, or degree of being variable or changeable.

n. the state or characteristic of being variable

n. the degree to which a thing is variable. In data or statistics this is often a measurement of distance from the mean or a description of data range.

n. The quality or state of being variable; variableness.

n. The power possessed by living organisms, both animal and vegetable, of adapting themselves to modifications or changes in their environment, thus possibly giving rise to ultimate variation of structure or function.

n. The quality or state of being variable; variableness.

n. In biology, ability to vary; capability of variation; susceptibility to modification under conditions of environment, whether inherited or acquired; that plasticity or modifiability of any organism in virtue of which an animal or a plant may change in form, structure, function, size, color, or other character, lose some character or acquire another, and thus deviate from its parent-form; also, the kind or rate of variation in a given instance; the fact or act of varying. See variation, 8, variety, 6.

n. In astronomy, the fact that a star or nebula changes its brightness in a more or less periodic manner.

n. the quality of being subject to variation

n. the quality of being uneven and lacking uniformity

"It is well known that the term variability is commonly employed in the broadest possible sense."

generative variability    coefficient of variability    relative variability   

variableness   

accessibility    advisability    availability    believability    collectibility    comparability    convertibility    credibility    culpability    deniability   

fluctuations    volatility    variation    instability    correlation    diversity    variance    deviation    divergence    heterogeneity