'Modifiable' definitions:

Definition of 'modifiable'

(from WordNet)
adjective
Capable of being modified in form or character or strength (especially by making less extreme); "the rhythm of physiological time is not modifiable except by interference with certain fundamental processes" - Alexis Carrel [ant: unmodifiable]

Definition of 'Modifiable'

From: GCIDE
  • Modifiable \Mod"i*fi`a*ble\, a. [From Modify.] Capable of being modified; liable to modification. [1913 Webster]