ESP, alternation, answer, coaction, commerce, communication, communion, complementary distribution, concurrence, congress, connection, contact, conversation, converse, cooperation, correspondence, dealing, dealings, engagement, exchange, information, interchange, intercommunication, intercommunion, intercourse, interlacing, intermeshing, interplay, intertwining, interweaving, interworking, linguistic intercourse, mesh, meshing, message, quid pro quo, reply, response, seesaw, social intercourse, speaking, speech, speech circuit, speech situation, talking, telepathy, tit for tat, touch, traffic, truck, two-way communication