Definition: mutable

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Source: WordNet (r) 1.7 

mutable
     adj : capable of or tending to change in form or quality or
           nature; "a mutable substance"; "the mutable ways of
           fortune"; "mutable weather patterns"; "a mutable
           foreign policy" [syn: changeable] [ant: immutable]

Source: Webster's Revised Unabridged Dictionary (1913) 

Mutable \Mu"ta*ble\, a. [L. mutabilis, fr. mutare to change. See
   Move.]
   1. Capable of alteration; subject to change; changeable in
      form, qualities, or nature.

            Things of the most accidental and mutable nature.
                                                  --South.

   2. Changeable; inconstant; unsettled; unstable; fickle.
      ``Most mutable wishes.'' --Byron.

   Syn: Changeable; alterable; unstable; unsteady; unsettled;
        wavering; inconstant; variable; fickle.