mediate

The story

1. Late Latin · derived frommediātus
2. Middle English · inherited frommediat(e)“intermediate; intercessory”
3. English todaymediate

The adjective is first attested in the 1440s in Middle English, the verb in 1538; from Middle English mediat(e) (“intermediate; intercessory”), borrowed from Late Latin mediātus, perfect passive participle of mediō (“to divide in the middle; (in Medieval Latin) to be in the middle, be or become between, mediate”) (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), from medius (“middle”) + -ō (verb-forming suffix).