'pro-anarchy' is a compound formed from the Latin prefix 'pro' (meaning 'for') combined with 'anarchy', which derives from Greek 'anarkhia' (ἀναρχία) meaning 'without a ruler'.

'anarchy' entered English via Latin and Old French from Greek 'anarkhia'; the productive Latin/English prefix 'pro-' (meaning 'for' or 'in favor of') has been used to form compounds in modern English, producing 'pro-anarchy' to express support for anarchy.

Originally Greek 'anarkhia' meant 'without a ruler'; over time 'anarchy' came to mean both the absence of government and the political philosophy that advocates that condition. 'Pro-anarchy' therefore evolved to mean 'in favor of the absence of government' or supportive of anarchist ideas.