资料来源 : Webster's Revised Unabridged Dictionary (1913)

Expectable \Ex*pect"a*ble\, a. [L. expectabilis.]
   That may be expected or looked for. --Sir T. Browne.

资料来源 : WordNet®

expectable
     adj : to be expected; "differences of opinion are quite expectable
           given the present information"