'Commutable' definitions:

Definition of 'commutable'

From: WordNet
adjective
Subject to alteration or change; "the death sentence was commutable to life imprisonment" [ant: incommutable]
adjective
Capable of being exchanged for another or for something else that is equivalent [syn: commutable, substitutable]

Definition of 'Commutable'

From: GCIDE
  • Commutable \Com*mut"a*ble\, a. [L. commutabilis.] Capable of being commuted or interchanged. [1913 Webster]
  • The predicate and subject are not commutable. --Whately. [1913 Webster]