intercommunication (n.)

• agglomeration
• agglutination
• aggregation
• alternation
• answer
• articulation
• bond
• clustering
• coaction
• combination
• commerce
• communication
• communion
• community
• concatenation
• concourse
• concurrence
• confluence
• congeries
• conglomeration
• congress
• conjugation
• conjunction
• connection
• contact
• convergence
• conversation
• converse
• cooperation
• copulation
• correspondence
• coupling
• dealing
• dealings
• engagement
• exchange
• fellowship
• gathering
• hookup
• information
• interaction
• interchange
• intercommunion
• intercourse
• interplay
• joinder
• joining
• jointure
• junction
• liaison
• linkage
• linking
• marriage
• meeting
• merger
• merging
• mesh
• meshing
• message
• pairing
• reply
• response
• seesaw
• speaking
• speech
• splice
• symbiosis
• talking
• telepathy
• tie
• tie-in
• tie-up
• touch
• traffic
• truck
• unification
• union