mediate

olla välissä

sovitella, toimia välittäjänä

epäsuora

keskikohta puhekieltä To resolve differences, or to bring about a settlement, between conflicting parties.
puhekieltä To intervene between conflicting parties in order to resolve differences or bring about a settlement.
To divide into two equal parts.

(rfquotek)

Vygotsky saw the development of language and mental powers as neither learned, in the ordinary way, nor emerging epigenetically, but as being social and mediate in nature, as arising from the interaction of adult and child, and as internalizing the cultural instrument of language for the processes of thought.

An act of mediate knowledge is complex.