Source : Webster's Revised Unabridged Dictionary (1913)

Arbitrable \Ar"bi*tra*ble\, a. [Cf. F. arbitrable, fr. L.
   arbitrari. See {Arbitrate}, v. t.]
   Capable of being decided by arbitration; determinable.
   [Archaic] --Bp. Hall.

Source : WordNet®

arbitrable
     adj : appropriate for or subject to settlement by arbitration; "an
           arbitrable wage and health benefits policy"; "an
           arbitrable dispute" [ant: {nonarbitrable}]