The Collaborative International Dictionary of English v.0.48:

Explicable \Ex"pli*ca*ble\, a. [L. explicabilis: cf. F.
   explicable.]
   Capable of being explicated; that may be explained or
   accounted for; admitting explanation.

   Syn: explainable. [1913 Webster]

              It is not explicable upon any grounds. --Burke.
        [1913 Webster]

WordNet (r) 3.0 (2006):

explicable
    adj 1: capable of being explicated or accounted for; "explicable
           behavior" [ant: incomprehensible, inexplicable]