noun (n)

• the property of flowing easily(noun.attribute)

  Example:
  Adding lead makes the alloy easier to cast because the melting point is reduced and the fluidity is increased.
  They believe that fluidity increases as the water gets warmer.
  

  Synonym:
  fluidness, liquidity, liquidness, runniness
  

  source: wordnet30
• a changeable quality(noun.attribute)

  Example:
  A charming Oriental fluidity of manner.
  Demographers try to predict social fluidity.
  

  Synonym:
  fluidness
  

  source: wordnet30
• The quality of being fluid or capable of flowing; a liquid, aëriform, or gaseous state; -- opposed to solidity.(noun)

  source: webster1913