'antiaristocracy' is formed in Modern English from the prefix 'anti-' + the noun 'aristocracy', where 'anti-' meant 'against' and 'aristocracy' comes from Greek 'aristokratia' meaning 'rule of the best'.

'aristocracy' originates from Greek 'aristokratia' (ἀριστοκρατία) meaning 'rule of the best'; through Latin and Old French forms it entered Middle English as 'aristocracie' and became modern English 'aristocracy'. The prefix 'anti-' comes from Greek 'anti' (ἀντί) via Latin/Modern English and was attached to form 'antiaristocracy'.

Initially, the elements meant 'against' + 'rule of the best'; over time the compound came to denote the political stance or movement opposing aristocratic rule or privilege in modern political discourse.