Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class V. Words Releasing to the Voluntary Powers
Division (I) Individual Volition
Section IV. Antagonism
2. Active Antagonism

724. Mediation.

   NOUN:MEDIATION, mediatorship, mediatization, mediatorialism; intervention, interposition, interference, intermeddling, intercession; parley, negotiation, arbitration; flag of truce [See Pacification]; good offices, peace offering; diplomatics [rare], diplomacy; compromise [See Compromise].
  MEDIATOR, intercessor, peacemaker, make-peace, negotiator, go-between; diplomatist (consignee) [See Consignee]; moderator; propitiator; umpire, arbitrator.
   VERB:MEDIATE, mediatize; intercede, interpose, interfere, intervene; step in, negotiate; meet halfway; arbitrate, propitiate; agree to arbitration; submit; componere lites [L.].
   ADJECTIVE:MEDIATORY, mediatorial, negotiable; mediating &c. v.; propitiatory, diplomatic.