Elinor remembered what Robert had told her in Harley Street, of his opinion of what his own mediation in his brother’s affairs might have done, if applied to in time.
She now found, that in spite of herself, she had always admitted a hope, while Edward remained single, that something would occur to prevent his marrying Lucy; that some resolution of his own, some mediation of friends, or some more eligible opportunity of establishment for the lady, would arise to assist the happiness of all.
There are no more uses of "mediate" in the book.
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By this time the two former friends were hardly speaking to each other and had to call in local elders to mediate.
Malala Yousafzai -- I Am Malala
Im— mediately after we were finished eating, Mambu gave each boy his share of the money.