a. [ Cf. F. préférable. ] Worthy to be preferred or chosen before something else; more desirable;
n. The quality or state of being preferable. [ 1913 Webster ]
a. Capable of being referred, or considered in relation to something else; assignable; ascribable.
It is a question among philosophers, whether all the attractions which obtain between bodies are referable to one general cause. W. Nicholson. [ 1913 Webster ]