'aristocratically' originates from Greek and later Latin/French, specifically the Greek word 'aristokratía' (ἀριστοκρατία), where 'aristos' meant 'best' and 'kratos' meant 'power' or 'rule'.

'aristocratically' changed from Greek 'aristokratía' into Late Latin 'aristocratia', then Old French 'aristocratie' and Middle English 'aristocracie'; the adjective 'aristocratic' developed from these forms and the adverb 'aristocratically' was formed from the adjective with the suffix -ally.

Initially it referred to 'rule by the best' (a political concept); over time it came to mean 'belonging to or characteristic of the aristocracy' and then the adverb developed the sense 'in an aristocratic manner' (describing style or behavior).