'Volatility' definitions:

Definition of 'volatility'

From: WordNet
noun
The property of changing readily from a solid or liquid to a vapor
noun
The trait of being unpredictably irresolute; "the volatility of the market drove many investors away" [syn: volatility, unpredictability]
noun
Being easily excited [syn: excitability, excitableness, volatility]

Definition of 'Volatility'

From: GCIDE
  • Volatileness \Vol"a*tile*ness\, Volatility \Vol`a*til"i*ty\, n. [Cf. F. volatilit['e].] Quality or state of being volatile; disposition to evaporate; changeableness; fickleness. [1913 Webster]
  • Syn: See Levity. [1913 Webster]