intercommunicate

verb2

1. •
   To communicate mutually, one with another.

   • There is also a growing number of teleradio stations on small inter-island craft. All these stations communicate with or through Vila, but may intercommunicate by permission. — 1951
2. •
   To be interconnected.

   • The two vehicles of each unit intercommunicate through a vestibule type corridor connection similar to that obtaining in long-distance passenger stock. — 1954