Immediate
late Middle English (in the sense ‘nearest in space or order’): from Old French immediat, or from late Latin immediatus, from in- ‘not’ + mediatus ‘intervening’, past participle of mediare (see mediate).
wiktionary
From Old French immediat, from Late Latin immediātus(“without anything between”), from Latin in + mediātus, past participle of mediō(“to halve, to be in the middle”), from medius(“middle”)
etymonline
immediate (adj.)
late 14c., "intervening, interposed;" early 15c., "with nothing interposed; direct," also with reference to time, "without delay, instant," from Old French immediat (14c.), from Late Latin immediatus "without anything between," from assimilated form of in- "not, opposite of" (see in- (1)) + mediatus "in the middle" (see mediate).
