1) Capable of being altered 2) Subject for being taken in 3) Subject to modification 1) Changeable 2) Commutable 
• (a.) Capable of being altered.
Al'ter·a·ble adjective [ Confer French altérable .] Capable of being altered. « Our condition in this world is mutable and uncertain, alterable by a thousand accidents. Rogers. » 
[adj] - capable of being changed or altered in some characteristic 2. [adj] - (law) of a sentence
alterable Capable of being changed.
adjective (of the punishment ordered by a court) capable of being changed to one less severe
capable of being altered.