The Collaborative International Dictionary of English v.0.48:
Alienable \Al"ien*a*ble\, a. [Cf. F. ali['e]nable.] Capable of being alienated, sold, or transferred to another; as, land is alienable according to the laws of the state. [1913 Webster]WordNet (r) 3.0 (2006):
alienable adj 1: transferable to another owner [ant: inalienable, unalienable]