Meaning

verb act between parties with a view to reconciling differences

adjective acting through or dependent on an intervening agency

verb occupy an intermediate or middle position or form a connecting link or stage between two others

originThe 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…

Etymology from Wiktionary, CC BY-SA 3.0