Source : Webster's Revised Unabridged Dictionary (1913)

Intercommunicate \In`ter*com*mu"ni*cate\, v. i.
   To communicate mutually; to hold mutual communication.

Intercommunicate \In`ter*com*mu"ni*cate\, v. t.
   To communicate mutually; to interchange. --Holland.

Source : WordNet®

intercommunicate
     v 1: be interconnected, afford passage; "These rooms
          intercommunicate"
     2: transmit thoughts or feelings; "He communicated his
        anxieties to the psychiatrist" [syn: {communicate}]