Variability

Noun

 * 1) the state or characteristic of being variable
 * 2) the degree to which a thing is variable

Synonyms

 * variableness

Thesaurus
arrhythmia, brokenness, capriciousness, changeability, changeableness, choppiness, dappleness, desultoriness, deviability, deviation, difference, differentiation, disconnectedness, discontinuity, disorder, divarication, divergence, diversification, eccentricity, erraticism, erraticness, fibrillation, fickleness, fitfulness, fits and starts, flightiness, fluctuation, freakishness, impulsiveness, inconsistency, inconstancy, inequality, instability, intermittence, irregularity, jerkiness, mercuriality, moodiness, motleyness, mutability, nonconformism, nonconformity, nonstandardization, nonuniformity, patchiness, pluralism, raggedness, restlessness, roughness, shiftiness, spasticity, sporadicity, sporadicness, spottiness, stagger, uncertainty, unconformism, unconformity, undependability, unevenness, unfixedness, unmethodicalness, unorthodoxy, unpredictability, unreliability, unsettledness, unstableness, unsteadfastness, unsteadiness, unsystematicness, variation, variegation, variety, variousness, versatility, wantonness, wavering, waywardness, whimsicality, wobble

Etymology
Derived form of variable which is from the Old French variable, from the Latin variabilis "changeable" from variare "to change"