ESP, agglomeration, agglutination, aggregation, alternation, answer, articulation, bond, bracketing, clustering, coaction, collegiality, combination, commerce, communication, communion, community, complementary distribution, 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, interlacing, interlinking, intermeshing, interplay, intertwining, interweaving, interworking, joinder, joining, jointure, junction, knotting, liaison, linguistic intercourse, linkage, linking, marriage, meeting, merger, merging, mesh, meshing, message, pairing, quid pro quo, reply, response, seesaw, social activity, social intercourse, social relations, speaking, speech, speech circuit, speech situation, splice, symbiosis, talking, telepathy, tie, tie-in, tie-up, tit for tat, touch, traffic, truck, two-way communication, unification, union, yoking