How to Say "intermediation" in Spanish
The Spanish word for “intermediation” is “mediación” — C1 level.
English → SpanishC1
nounC1formal
acting as a bridge between two concepts

Examples
Percibimos la realidad a través de la mediación del lenguaje.
We perceive reality through the agency (or bridge) of language.
Abstract usage
In this context, the word describes a 'middle step' that connects two different things.
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