'pro-feudal' originates from Latin and Medieval Latin roots: the prefix 'pro-' originates from Latin, specifically the word 'pro', where 'pro' meant 'for', and 'feudal' originates from Medieval Latin 'feudalis' (from Late Latin 'feudum'), where 'feudum' meant 'fief'.

'pro-feudal' changed through the evolution of 'feudum' (Late Latin) → 'feudalis' (Medieval Latin) → Old French/Anglo-Norman forms and then English 'feudal', and the modern compound 'pro-feudal' was formed by combining the Latin prefix 'pro-' ('for') with 'feudal'.

Initially the elements referred to 'for' (pro-) and 'fief'/'fiefdom' (feudum), but over time the compound meaning developed into 'in favor of feudalism' or 'supporting feudal social/political order'.