'pro-revolution' originates from the Latin prefix 'pro-' and the Latin noun 'revolutio' (via Old French 'revolution'), where 'pro-' meant 'for' and 'revolutio' meant 'a turning' or 'a rolling back'.

'pro-' (Latin) + 'revolutio' (Latin) → Old French 'revolution' → Middle English 'revolucioun' → modern English 'revolution', combined with the Latin prefix 'pro-' to form a compound meaning 'for revolution'.

Originally elements meant 'for' (pro-) and 'a turning' (revolutio); over time the combined form came to mean specifically 'in favor of overthrowing or radically changing established authority', i.e. 'supporting revolutionary change'.