Wordnet 3.0
NOUN (1)
1. 
 the property of flowing easily; 
- Example: "adding lead makes the alloy easier to cast because the melting point is reduced and the fluidity is increased"- Example: "they believe that fluidity increases as the water gets warmer"[syn: fluidity, fluidness, liquidity, liquidness, runniness]
WordNet (r) 3.0 (2006):
runniness
    n 1: the property of flowing easily; "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" [syn: fluidity,
         fluidness, liquidity, liquidness, runniness]