'antiaristocratically' originates from Modern English, specifically built from the prefix 'anti-' (from Greek 'antí') where 'anti-' meant 'against', and 'aristocratic' from Greek 'aristokratia' where 'aristo-' meant 'best' and '-kratia' (or '-kratos') meant 'rule' or 'power'.

'antiaristocratically' arose by combining the Modern English prefix 'anti-' with 'aristocratic' (itself from Latin/Old French forms of Greek 'aristokratia'); the adjective 'aristocratic' developed via Latin and Old French from Greek, and the adverb was formed by adding the English adverbial suffix '-ally' to 'antiaristocratic', yielding 'antiaristocratically'.

Initially the elements meant 'against' (anti-) and 'rule by the best' (aristokratia), and over time the compound came to mean 'in a way opposed to aristocratic rule or principles', a usage consistent with modern English compounds.