To mediate is to be somewhat of a middle man in between two people or more who are having an argument/discussion, this person helps so that things dont get out of control and the parties can reach a resolution calmly.
The Latin root word medi means “middle.” This Latin root is the word origin of a large number of English vocabulary words, including medieval, mediocre, and media. This Latin root word medi is easily recalled through the word medium, for a “medium” temperature is right in the “middle” of being hot and cold.