interplay (n.)

• alternation
• answer
• coaction
• commerce
• communication
• communion
• commutation
• concurrence
• congress
• connection
• contact
• conversation
• converse
• cooperation
• correspondence
• dealing
• dealings
• dovetail
• engage
• engagement
• exchange
• give-and-take
• information
• interaction
• interchange
• intercommunication
• intercommunion
• intercourse
• mesh
• meshing
• message
• mortise
• mutuality
• permutation
• reciprocality
• reciprocation
• reciprocity
• reply
• response
• retaliation
• seesaw
• speaking
• speech
• talking
• telepathy
• touch
• traffic
• transposition
• truck