Meaning

verb act between parties with a view to reconciling differences

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

adjective acting through or dependent on an intervening agency

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