Source : Webster's Revised Unabridged Dictionary (1913)

Communicatory \Com*mu"ni*ca"to*ry\, a. [LL. communicatorius.]
   Imparting knowledge or information.

         Canonical and communicatory letters.     --Barrow.

Source : WordNet®

communicatory
     adj : able or tending to communicate; "was a communicative person
           and quickly told all she knew"- W.M.Thackeray [syn: {communicative}]
           [ant: {uncommunicative}]