The story
- Proto-Indo-European · derived from*medʰyo-“between”
- Proto-Italic · derived from*meðios
- Latin · derived frommediānt-“being in the middle”
- Italian · borrowed frommediante
- English todaymediant
From Italian mediante, from Latin mediānt- (“being in the middle”), present active participle of mediō (“to be in the middle”), from medius (“middle”), from Proto-Italic *meðios, from Proto-Indo-European *medʰyo- (“between”).
Etymology from Wiktionary, CC BY-SA 4.0.