noun (n)

• the quality of being subject to variation(noun.attribute)

  Synonym:
  variableness, variance
  Antonym:
  invariability, invariableness, invariance
  

  source: wordnet30
• the quality of being uneven and lacking uniformity(noun.attribute)

  Synonym:
  unevenness
  Antonym:
  evenness, invariability
  

  source: wordnet30
• The quality or state of being variable; variableness.(noun)

  source: webster1913