'archplutocrat' originates from Modern English, specifically by combining the prefix 'arch-' and the noun 'plutocrat', where 'arch-' (from Greek) meant 'chief' or 'principal' and 'plutocrat' meant 'wealth-ruler'.

'archplutocrat' was formed in modern English as a compound of 'arch-' (from Greek ἀρχ-) and 'plutocrat' (itself from Greek 'ploutokratēs' via modern coinage), rather than evolving through a single earlier medieval English form.

Initially the components separately meant 'chief' (arch-) and 'ruler by wealth' (plutocrat); combined, they have come to mean specifically 'the foremost or dominant member of a wealthy ruling class'.