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WordNet (r) 3.0 (2006) (WordNet)

fluidness
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" [synonym: {fluidity},
{fluidness}, {liquidity}, {liquidness}, {runniness}]
2: a changeable quality; "a charming Oriental fluidity of
manner"; "a certain fluidness in his perception of time made
him an unpredictable colleague"; "demographers try to predict
social fluidity" [synonym: {fluidity}, {fluidness}]