to intervene between parties in order to reconcile them
to bring about (a settlement) by mediation
to act as a mediator in (a dispute)
to act as intermediary agent in bringing, effecting, or communicating (something)
technical to transmit or effect (something) by acting as an intermediate mechanism or agency
mediation /-ʹaysh(ə)n/ noun
mediator noun
mediatory /-·ət(ə)ri/ adj
[late Latin mediatus, past part. of mediare to be in the middle, from Latin medius middle]