'Changeability' definitions:

Definition of 'changeability'

From: WordNet
noun
The quality of being changeable; having a marked tendency to change; "the changeableness of the weather" [syn: changeableness, changeability] [ant: changelessness, unchangeability, unchangeableness, unchangingness]

Definition of 'Changeability'

From: GCIDE
  • Changeability \Change`a*bil"i*ty\, n. Changeableness. [1913 Webster]