Webster's Revised Unabridged Dictionary · 1913

Mediation

Mediation , noun

[Old English mediacioun, French médiation. See Mediate, a.]

1.
The act of mediating; action or relation of anything interposed; action as a necessary condition, means, or instrument; interposition; intervention.
The soul [acts] by the mediation of these passions. — South
2.
Hence, specifically, agency between parties at variance, with a view to reconcile them; entreaty for another; intercession. — Bacon