Webster's English Dictionary

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mutable

mu.ta.ble \'myu:t-*-b*l\ \-ble-\ aj [L mutabilis, fr. mutare to change - 
   more at MISS] 1: prone to change : INCONSTANT  2a: capable of change or of 
   being changed in form, quality, or nature  2b: capable of or liable to 
   mutation  - mu.ta.ble.ness n