|Origin:||, past participle of mediare, from Latin medius; MEDIUM2|
1 [intransitive and transitive]
to try to end a quarrel between two people, groups, countries etc
UN officials mediated between the rebel fighters and the government.
The former president has agreed to mediate the peace talks.
2 [transitive usually passive] formal or technical
to change the effect or influence of something, especially to make the effect less bad:
Exercise may mediate the effects of a bad diet.
—mediation noun [uncountable]