1. (n.) The quality or state of being variable; variableness.

2. (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.

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