'archprelatical' originates from the prefix 'arch-' (from Greek 'arkhi-' meaning 'chief') combined with 'prelate' (from Latin 'praelatus', the past participle of 'praeferre') and the adjectival suffix '-ical'.

'archprelatical' developed in English by combining 'arch-' + 'prelate' to form 'archprelate' and then adding the suffix '-ical' to create the adjective 'archprelatical'.

Initially it meant 'pertaining to an archprelate' and has retained that specific ecclesiastical meaning, though it remains rare and chiefly literary or historical in use.